List of largest locomotives

Last updated February 27, 2023

As railroads around the world haul larger quantities of freight efficiently, the title of world's most powerful locomotive has often been passed to new generations of rolling stock.

Standard

There are many ways in which a locomotive can be the largest: the heaviest, longest, most cylinders, most power, or most wheels. It is often defined as the longest in length, but there is even a debate^{[ according to whom? ]} on whether or not to include the tender, which is equivalent to the fuel tank of a diesel, in the measurement. To establish the "largest" category, several factors take precedence: overall weight, which gives traction over driving axles; size (length & height of engine itself); and power, which may be in terms of raw horsepower, tractive effort, available power at axles (shaft horsepower) or, in the case of steam locomotives, available steam on a sustained basis.

List

Name	Railway	Series	Manufacturer	Dates	Motive power	Wheel arrangement	Weight	Tractive Effort/Force	Power	Notes
WAG-12	Indian Railways	WAG	Alstom prima	2020-present	25KV 50Hz AC	Bo′Bo′+Bo′Bo′	180 tonnes	158,715 pounds-force (706 kN)	12,000 hp	New generation engine operated through twin engines
China Railways HXD1D prototype	None (experimental)	N/A	CSR Zhuzhou	Before 2012	Electric	Co'Co'		77,694 pounds-force (346 kN )	12,874 horsepower (9,600 kW )	Currently stored in Zhuzhou plant.
060-EA	Romanian Railways (CFR) and numerous private railways in Romania and Hungary	40 (060-EA): 120 km/h, 41 (060-EA1): 160 km/h, 42: 200 km/h	ASEA (first ten), Electroputere Craiova (the rest, approx. 1,000)	1965-91	Electric	Co'Co'	120 tonnes (132 short tons )	93,000 pounds-force (414 kN )	6,839 horsepower (5,100 kW )	Powerful locomotive in the 1970s; high continuous tractive effort.
2-10-10-2	Santa Fe and Virginian Railway	3000-3009 (Santa Fe) 800-809 (Virginian)	Baldwin Locomotive Works (Santa Fe) American Locomotive Company (Virginian)	1911-1912, 1918	Steam	2-10-10-2	415 tonnes (457 short tons )	175,000 pounds-force (778 kN ) simple; 147,200 pounds-force (655 kN ) compound	—	Weight and performance figures listed for the Virginian variant, as that locomotive was the heavier and more powerful of the two.
2ES10S (3ES10)	Russian Railways	—	Ural Locomotives	2014–present	Electric	3xBo'Bo'	300 tonnes (331 short tons )	264,375 pounds-force (1,176 kN )	17,701 horsepower (13,200 kW ) 1-hour rating	Three sections modification of 2ES10.
4E5K	Russian Railways	—	Novocherkassk Electric Locomotive Plant	2014–present	Electric	4xBo'Bo'	392 tonnes (432 short tons )	304,840 pounds-force (1,356 kN )	17,594 horsepower (13,120 kW ) 1-hour rating	Four sections modification of E5K.
AA20	Russian Railways	6001-6042	Voroshilovgrad	1934	Steam	4-14-4	20 tonnes (22 short tons )	71,940 pounds-force (320 kN )	3,652 horsepower (2,723 kW )	Largest non-articulated steam locomotive, and the only seven-axle non-articulated steam locomotive ever built.
AD43C	Iranian Railways (RAI)	2001-2100	Alstom	2001	Diesel electric	Co'Co'	120 tonnes (132 short tons )	122,000 pounds-force (543 kN )	4,300 horsepower (3,207 kW )	About 50 locomotives are stopped because of failures in the RK 215 diesel engines
AD60 class	New South Wales Government Railways	6001-6042	Beyer, Peacock & Company	1952–1954, 1956	Steam	4-8-4+4-8-4	255 tonnes (281 short tons )	59,575 pounds-force (265 kN )	5,930 horsepower (4,422 kW )	Largest steam locomotive ever operated in Australia^[1]
Ae 6/6	Swiss Federal Railways	11401-11520	SLM, MFO/BBC	1952; 1955–66	Electric	Co'Co'	120 tonnes (132 short tons )	88,125 pounds-force (392 kN )	5,766 horsepower (4,300 kW ) continuous	Still in operation as of October 2012^[update]
Ae 6/8	BLS, Switzerland	201-208	SLM / Sécheron	1939	Electric	(1'Co)(Co1')	140 tonnes (154 short tons )	79,360 pounds-force (353 kN )	5,914 horsepower (4,410 kW ) 1-hour rating	Two remain in working order as heritage locos^{[ when? ]}
Ae 8/8	BLS, Switzerland	271-275	SLM / BBC	1959-66	Electric	(Bo)(Bo)+(Bo)(Bo)	160 tonnes (176 short tons )	105,885 pounds-force (471 kN )	8,683 horsepower (6,475 kW ) 1-hour rating	One preserved in working order.^{[ when? ]}
Ae 8/14	Swiss Federal Railways	11852	SLM, MFO/BBC	1939	Electric	(1'A)A1'A(A1')+(1'A)A1'A(A1')	236 tonnes (260 short tons )	110,160 pounds-force (490 kN )	10,945 horsepower (8,162 kW ) 1-hour rating; 10,255 horsepower (7,647 kW ) continuous	Exhibit at Swiss Museum of Transport
Allegheny	Chesapeake & Ohio Railway Virginian Railway	1600-1659 (C&O), 900-907 (VGN)	Lima Locomotive Works	1941–48	Steam	2-6-6-6	544 tonnes (600 short tons )	110,000 pounds-force (489 kN )	7,500 horsepower (5,593 kW )	Two on static display
Big Blow	Union Pacific	1-30 (control cab), 1B-30B (turbine unit)	General Electric	1958–61	Gas turbine-electric	C-C+C-C	425 tonnes (468 short tons )	212,312 pounds-force (944 kN )	8,469 horsepower (6,315 kW ); over 10,000 hp at lower altitude and ambient temperatures (turbine only)	Two preserved in museums; Surpassed by GT1s.
Big Boy	Union Pacific	4000-4024	ALCO	1941-–44	Steam	4-8-8-4	548 tonnes (604 short tons )	135,375 pounds-force (602 kN )	6,290 horsepower (4,690 kW )	Several on static display. No. 4014 in service with the UP Heritage Steam collection^[2]
BJ 6001	China Railway	北京6001	Beijing Feb. 7th	1969	Diesel-hydraulic	D'D'	—	—	5,900 horsepower (4,400 kW )	Most powerful diesel-hydraulic locomotive ever built.
Challenger	Union Pacific	3950-3999	ALCO	1936–43	Steam	4-6-6-4	485 tonnes (535 short tons )	97,350 pounds-force (433 kN )	5,000 horsepower (3,728 kW )	Two locomotives preserved, one on static display. Union Pacific 3985 operated for company PR and occasional excursion service from 1981-2010. Donated to Railroading Heritage of Midwest America in April 2022^[3]
China Railways DF8DJ	China Railways	DF8DJ0001, later DF8B5672	CSR Ziyang	2006	Diesel-electric	Co'Co'	150 tonnes (165 short tons ; 148 long tons )	130,389 pounds-force (580 kN ) starting 98,916 pounds-force (440 kN ) continuous	6,437 horsepower (4,800 kW )	Most powerful single-engine diesel locomotive ever built.
China Railways HXD1	China Railway	HXD10001 - HXD10220	CSR Zhuzhou Electric Locomotive, Siemens	2006–08	Electric	Bo'Bo'+Bo'Bo'	200 tonnes (220 short tons )	170,000 pounds-force (756 kN ) starting; 111,000 pounds-force (494 kN ) continuous	12,874 horsepower (9,600 kW )	—
China Railways HXD1B	China Railway	HXD1B0001-HXD1B0500	CSR Zhuzhou Electric Locomotive, Siemens	2009–	Electric	Co'Co'	150 tonnes (165 short tons )	—	12,874 horsepower (9,600 kW )	One of the most powerful single-frame locomotives currently^{[ when? ]} in series production.
China Railways HXD1C	China Railway	HXD1C0001-HXD1C0990	CSR Zhuzhou Electric Locomotive, Siemens	2009–	Electric	Co'Co'	150 tonnes (165 short tons )	170,000 pounds-force (756 kN ) starting; 111,000 pounds-force (494 kN ) continuous	9,655 horsepower (7,200 kW )	—
China Railways HXD2	China Railway	HXD20001- HXD20180	Datong Electric Locomotive, Alstom	2006–08	Electric	Bo'Bo'+Bo'Bo'	200 tonnes (220 short tons )	170,000 pounds-force (756 kN )	13,410 horsepower (10,000 kW )	—
China Railways HXD2B	China Railway	HXD2B0001-HXD2B0500	Datong Electric Locomotive, Alstom	2009–	Electric	Co'Co'	150 tonnes (165 short tons )	131,000 pounds-force (583 kN ) starting; 125,000 pounds-force (556 kN ) continuous	12,874 horsepower (9,600 kW )	One of the most powerful single-frame locomotives currently^{[ when? ]} in series production.
China Railways HXD2C	China Railway	HXD2C0001-	Datong Electric Locomotive, Alstom	2010–	Electric	Co'Co'	150 tonnes (165 short tons )	130,000 pounds-force (578 kN ) starting; 90,000 pounds-force (400 kN ) continuous	9,655 horsepower (7,200 kW )	—
China Railways HXD3	China Railway	HXD30001-HXD30890, HXD38001-38150	Toshiba, Dalian Locomotive	2006–09	Electric	Co'Co'	150 tonnes (165 short tons )	130,000 pounds-force (578 kN )	9,655 horsepower (7,200 kW )	—
China Railways HXD3B	China Railway	HXD3B0001-HXD3B0500	Dalian, Bombardier	2009–	Electric	Co'Co'	150 tonnes (165 short tons )	128,000 pounds-force (569 kN ) starting; 114,000 pounds-force (507 kN )	12,874 horsepower (9,600 kW ) 1-hour rating	One of the most powerful single-frame locomotives currently^{[ when? ]} in series production.
China Railways HXD3C	China Railway	HXD3C0001-	Dalian, Bombardier	2010–	Electric	Co'Co'	150 tonnes (165 short tons )	130,000 pounds-force (578 kN ) starting; 83,000 pounds-force (369 kN )	9,655 horsepower (7,200 kW )	—
China Railways HXN3	China Railway	HXN30001 - HXN30300	Dalian Locomotive, Electro-Motive Diesel	2008–	Diesel-Electric	Co'Co'	150 tonnes (165 short tons )	140,000 pounds-force (623 kN ) starting; 134,000 pounds-force (596 kN ) continuous	6,300 horsepower (4,698 kW )	Most powerful diesel-electric locomotive in active production.^{[ when? ]}
China Railways HXN5	China Railway	HXN50001 - HXN50300	GE, CRRC Qishuyan	2008–	Diesel-Electric	Co'Co'	150 tonnes (165 short tons )	140,000 pounds-force (623 kN ) starting; 127,000 pounds-force (565 kN ) continuous	6,250 horsepower (4,661 kW )	Most powerful diesel-electric locomotive in active production.^{[ when? ]}
Class 461	Železnice Srbije, Serbia	ŽS461-0/1, ŽS461-2	Electroputere Craiova, Romania	1965–91	Electric	Co'Co'	120 tonnes (132 short tons )	88,125 pounds-force (392 kN )	7,638 horsepower (5,696 kW )	Operational in Romania, Serbia, Montenegro, Bulgaria, Hungary & Macedonia.^{[ when? ]}
DB Class 101	Deutsche Bahn	101 001-145	Adtranz	1996–99	Electric	Bo'Bo'	83 tonnes (91 short tons )	67,443 pounds-force (300 kN )	8,583 horsepower (6,400 kW ) continuous	Maximum speed 220 km/h (137 mph).
DB Class 103	Deutsche Bahn	103 101-245	AEG, Brown, Boveri & Cie, Henschel, Krauss-Maffei, Krupp, Siemens	1970–73	Electric	Co'Co'	114 tonnes (126 short tons )	70,140 pounds-force (312 kN )	16,270 horsepower (12,133 kW ) or 13,900 horsepower (10,365 kW ) short term; 10,433 horsepower (7,780 kW ) 1-hour rating; 9,977 horsepower (7,440 kW ) continuous rating	One of the most powerful electric locomotives ever built, it also is the most powerful single-frame locomotive ever built (currently^{[ when? ]} its maximum short term power is limited to 12,000 horsepower (8,948 kW )); It has immense short term power with a tractive effort of 312 kN up to a speed of 140 km/h (87 mph).
DB Class 151	Deutsche Bahn	151 001-170	AEG, BBC, Henschel, Krauss-Maffei, Krupp, Siemens	1972–78	Electric	Co'Co'	118 tonnes (130 short tons )	88,800 pounds-force (395 kN )	8,432 horsepower (6,288 kW )	Powerful freight locomotive in the 1970s with high continuous tractive effort.
DSB EG	DB Schenker Rail	3103-3113	Siemens	1999–2000	Electric	Co'Co'	132 tonnes (146 short tons )	89,930 pounds-force (400 kN )	8,717 horsepower (6,500 kW ) continuous	One of the most powerful single-frame electric locomotives in operation in Europe^{[ when? ]}.
EMD DDA40X	Union Pacific	6900-6946	Electro-Motive Diesel	1969–71	Diesel-electric	Do'Do'	244 tonnes (269 short tons )	113,940 pounds-force (507 kN ) starting; 103,000 pounds-force (458 kN ) continuous	6,600 horsepower (4,922 kW )	One operational, 13 in various museums; largest operational single-unit diesel locomotive and the most powerful.^{[ when? ]}
EMD SD70ACe-T4	Union Pacific BNSF CSX	3000-3099 (Union Pacific)	Electro-Motive Diesel (EMD)	2015–present	Diesel-electric	Co'Co'	218 tonnes (240 short tons )	200,000 pounds-force (890 kN ) starting 175,000 pounds-force (778 kN ) continuous	4,400 horsepower (3,281 kW )	—
EMD SD90MAC	Union Pacific	8500-8561	Electro-Motive Diesel	1996–2002	Diesel-electric	Co'Co'	210 tonnes (231 short tons )	200,000 pounds-force (890 kN ) starting; 165,000 pounds-force (734 kN ) continuous	6,300 horsepower (4,698 kW )	Retired from service, some on lease with EMLX^{[ when? ]}.
Erie Class P-1	Erie Railroad	2603-2605, later 5014-5016	Baldwin Locomotive Works	1914-1916	Steam	2-8-8-8-2	531 tonnes (585 short tons )	176,256 pounds-force (784 kN )	—	Maximum speed approx. 10 mph.
EuroSprinter	Deutsche Bahn, ÖBB	—	Krauss-Maffei, Siemens	1996–2001	Electric	Bo'Bo'	86 tonnes (95 short tons )	67,000 pounds-force (298 kN )	9,790 horsepower (7,300 kW ) short term; 8,583 horsepower (6,400 kW ) continuous	Maximum speed 230 km/h (143 mph); Taurus Rh 1216 050-5 holds the world speed record for conventional electric locomotives ^{[ when? ]} at 357 km/h (222 mph).
Eurotunnel Class 9	Getlink	9000	Euroshuttle Locomotive Consortium	1993-2002	Electric	Bo-Bo-Bo	132 tonnes (146 short tons )	90,000 pounds-force (400 kN ) starting; 70,000 pounds-force (311 kN ) continuous	9,400 horsepower (7,010 kW )	Always used in pairs (one at each end of the train). Early versions were 7,500 horsepower (5,593 kW ) but most have been rebuilt to 7 MW.
GE AC6000CW	Union Pacific; CSX; BHP	600-699, 5000-5016, 6070-6077, 7500-7579 (being overhauled^{[ when? ]} and renumbered 69xx)	General Electric	1996–2001	Diesel-electric	Co'Co'	210 tonnes (231 short tons )	188,000 pounds-force (836 kN ) starting; 166,000 pounds-force (738 kN ) continuous	6,250 horsepower (4,661 kW )	Actual HP output on early production units is 4,350 hp due to use of the 7FDL engine.
GT1s	Russian Railways	—	Sinara transport machines	—	Gas turbine-electric	—	360 tonnes (397 short tons )	220,313 pounds-force (980 kN )	11,130 horsepower (8,300 kW )	Currently the most powerful non-electric locomotive ever produced.
H220	Victorian Railways	H class	Newport Workshops	1941–1958	Steam	4-8-4	265 tonnes (292 short tons )	55,060 pounds-force (245 kN )	3,600 horsepower (2,685 kW )	The most powerful steam locomotive built in Australia at the time. Only one was constructed, preserved at the Australian Railway Historical Society Museum.^[4]
Indian locomotive class WAG-7	Indian Railways	27001-27999, 28000-28770, 24501-24700	Chittaranjan Locomotive Works, India, BHEL, India	1992	Electric	Co'Co'	132 tonnes (146 short tons )	135,000 pounds-force (601 kN )	8,200 horsepower (6,115 kW )	N/A
Indian locomotive class WAG-9	Indian Railways		Chittaranjan Locomotive Works, Electric Locomotive Works, Bhusawal	1996–	Electric	Co'Co'	123 tonnes (136 short tons )	100,000 pounds-force (445 kN ); 73,000 pounds-force (325 kN ) continuous	6,600 horsepower (4,922 kW )
Indian locomotive class WAG-9H	Indian Railways		Chittaranjan Locomotive Works, Electric Locomotive Works, Bhusawal	2000–	Electric	Co'Co'	132 tonnes (146 short tons )	120,000 pounds-force (534 kN ) Continuous:73,000 pounds-force (325 kN )	6,600 horsepower (4,922 kW )
Indian locomotive class WAG-9HH	Indian Railways	90001+	Chittaranjan Locomotive Works, India	2019-	Electric	Co'Co'	135 tonnes (149 short tons )		9,000 horsepower (6,711 kW )
Indian locomotive class WAG-11	Indian Railways	29001+	Banaras Locomotive Works Varanasi	2018 - Present	Electric	Co'Co'			11,000 horsepower
Indian locomotive class WAG-12	Indian Railways	WAG12B60001+ onward	ELF Madhepura	2018–present	Electric	Bo'Bo'+Bo'Bo'	180 tonnes (198 short tons ; 177 long tons ) Up-gradable to 200 tonnes (220 short tons ; 197 long tons )	176,475 pounds-force (785 kN ) starting	12,000 horsepower (8,948 kW )
IORE	MTAB	IORE 101 - 126	Bombardier	2000–04	Electric	Co'Co'+Co'Co'	360 tonnes (397 short tons )	314,732 pounds-force (1,400 kN )	14,483 horsepower (10,800 kW ) continuous rating (for a pair)	The most powerful double-frame locomotive in series production.^{[ when? ]} It also has the largest tractive effort of any locomotive ever built.^{[ when? ]} It is possible to operate individual halves, however it is not usually done.
Jawn Henry	Norfolk & Western	2300	Baldwin Locomotive Works	1954-58	Steam turbine electric	C+C-C+C	404 tonnes (445 short tons )	175,000 pounds-force (778 kN )^[5]	4,500 horsepower (3,356 kW )	Struck from the N&W roster on January 4, 1958.
JR Freight Class EF200	JR Freight	—	Hitachi	1990–	Electric	Bo'Bo'Bo'	100.8 tonnes (111 short tons )	59,000 pounds-force (262 kN )	8,046 horsepower (6,000 kW )	Most powerful single-frame narrow-gauge locomotive in series production^{[ when? ]}.
Korail Class 8500	Korail	8501-8587	Hyundai Rotem	2012-2014	Electric	Co'Co'	132 tonnes (146 short tons )	101,164 pounds-force (450 kN )	9,600 horsepower (7,159 kW ) (1-hour rating); 9,300 horsepower (6,935 kW ) continuous	73 feet (22 m ) overall length.
Little Joe	Milwaukee Road	EF-4 and EP-4	General Electric	1950-80	Electric	2-D+D-2	247.5 tonnes (273 short tons )	75,700 pounds-force (337 kN )	5,110 horsepower (3,811 kW )	Maximum speed of 68 mph, used for freight and passenger.
M1	Chesapeake & Ohio Railway	500-502	Baldwin Locomotive Works	1947–50	Steam turbine electric	2-C1-2-C1-B (4-8-0-4-8-4)	428 tonnes (472 short tons )	98,000 pounds-force (436 kN )	6,000 horsepower (4,474 kW ) turbine; 4,960 horsepower (3,699 kW ) generators	Nicknamed "Sacred Cows". Sold back to Baldwin in 1950 and scrapped.
Norfolk & Western Y Class	Norfolk & Western	—	Roanoke Shops	1940s	Steam	2-8-8-2	449 tonnes (495 short tons )	166,000 pounds-force (738 kN )	5,600 horsepower (4,176 kW )	Norfolk and Western 2156 is strongest-pulling steam locomotive still in existence^{[ when? ]}.
PRR GG1	Pennsylvania Railroad, Penn Central, Conrail, Amtrak and NJ Transit	4800-4938, 900-929	Altoona Works, General Electric	1934–43	Electric	2-C+C-2 (4-6-6-4)	216.4 tonnes (239 short tons )	65,500 pounds-force (291 kN )	4,629 horsepower (3,452 kW )	Most scrapped; the prototype and 15 production locomotives have been preserved in museums.
PRR Q2	Pennsylvania Railroad	6131, 6175-6199	Altoona Works	1941–45	Steam	4-4-6-4	456 tonnes (503 short tons )	115,816 pounds-force (515 kN ) with booster	7,987 horsepower (5,956 kW )	Most powerful steam locomotive ever static tested.
PRR S1	Pennsylvania Railroad	6100	Altoona Works	1939	Steam	6-4-4-6	487 tonnes (537 short tons )	76,403 pounds-force (340 kN )	7,200 horsepower (5,369 kW )	Fast passenger steam locomotive; the magazine Popular Mechanics cites 1941 a speed of 133.4 mph (214.7 km/h)
PRR S2	Pennsylvania Railroad	6200	Baldwin Locomotive Works	1944	Steam turbine direct-drive	6-8-6	470 tonnes (518 short tons )	70,500 pounds-force (314 kN )	6,900 horsepower (5,145 kW )	Most powerful steam turbine locomotive ever built.
Re 4/4	BLS, Switzerland	Re 425 161-Re 425 195)	SLM / BBC	1964-83	Electric	Bo'Bo'	80 tonnes (88 short tons )	70,590 pounds-force (314 kN )	6,678 horsepower (4,980 kW ) continuous	In operation as of October 2012^[update]
Re 465	BLS, Switzerland	Re 465 001-465 0018	SLM, ABB	1994-97	Electric	Bo'Bo'	84 tonnes (93 short tons )	71,940 pounds-force (320 kN )	9,390 horsepower (7,002 kW ) short term 8,410 horsepower (6,271 kW ) continuous;	Similar locomotives with slightly different technical data are in operation with SBB (Re 460; 119 pc/NSB (El 18; 22 pc)/VR (Sr2; 46 pc)/KCRC (Hong Kong; 2 pc).
Re 6/6	SBB, Switzerland	11601-11689	SLM, MFO/BBC/Sécheron	1972, 1975–80	Electric	Bo'Bo'Bo'	120 tonnes (132 short tons )	89,475 pounds-force (398 kN )	10,460 horsepower (7,800 kW ) 1-hour rating; 9,705 horsepower (7,237 kW ) continuous	At the time of construction (1972) one of the world's most powerful locomotives. Currently in operation as of May 2022^[update] with the revised classification of Re 620.
Shen 24 ^[6]^[7]	Shenhua Mining Group		CRRC Zhuzhou	2020–present	Electric	6xBo'Bo'		512,564 pounds-force (2,280 kN)	28,800 kilowatts (38,621 hp )	Six-section modification of HXD1, 106 metres (348 ft ) long overall.
Shenhua Mining Group HXD1	Shenhua Mining Group	HXD1.7	CRRC Zhuzhou	2013	Electric	3xBo'Bo'	276 tonnes (304 short tons ; 272 long tons )	256,282 pounds-force (1,140 kN )	12,900 horsepower (9,620 kW ) continuous rating	Heavy haul locomotive of China
SJ Dm3	SJ	—	ASEA	1953–71	Electric	1'D+D+D1'	273 tonnes (301 short tons )	211,320 pounds-force (970 kN)	7,200 kilowatts (9,655 hp )	Highest continuous tractive effort when built, most powerful locomotive using jackshafts.
Softronic Transmontana	Romanian Railways (CFR) and diverse private railways in Romania and Hungary	480 (Romania) 610 (Hungary)	Softronic Craiova	2010–present	Electric	Co'Co'	120 tonnes (132 short tons )	97,800 pounds-force (435 kN )	8,851 horsepower (6,600 kW ) 1-hour rating; 8,046 horsepower (6,000 kW ) continuous	Based on the ASEA 060-EA, but with asynchronous traction motors, IGBT and computerized control.
Stadler Euro Dual	N/A	N/A	Stadler Rail	2012	Dual power electro-diesel locomotive	Co'Co'	114 tonnes (126 short tons ) - 126 tonnes (139 short tons )	107,000 pounds-force (476 kN )	9,387.15 horsepower (7,000 kW )
Union Pacific 9000 class	Union Pacific	9000-9087	American Locomotive Company	1926-1930	Steam	4-12-2	355 tonnes (391 short tons )	97,664 pounds-force (434 kN )	4,750 horsepower (3,542 kW )	—
Union Pacific Coal GTELs	Union Pacific	80 (later 8080)	Union Pacific Omaha Shops	1961	Diesel-electric + gas turbine-electric	A1A-A1A+2-D-D-2	661 tonnes (729 short tons )	—	7,000 horsepower (5,220 kW ) (2,000 hp Diesel + 5,000 hp turbine)	Home-built experimental coal-fired gas turbine. Assembled from ALCO PA-1 UP #607, GN W1 #5018, and the tender from Challenger #3990. 215 feet (66 m ) overall length; 1,457,280 pounds (661,011 kg) total weight. Unsuccessful; set aside in 1964 and scrapped in 1968.
Virginian Railway EL-3A	Virginian Railway	100-109	ALCO + Westinghouse	1925-1926	Electric	1-D-1+1-D-1+1-D-1	624 tonnes (688 short tons )	277,500 pounds-force (1,234 kN )	7,125 horsepower (5,313 kW ) (1-hour rating); 6,000 horsepower (4,474 kW ) continuous	152.25 feet (46 m ) overall length.
VL85	Russian Railways	270	Novocherkassk Electric Locomotive Plant	1983-94	Electric	Bo'Bo'Bo'+Bo'Bo'Bo'	300 tonnes (331 short tons )	209,522 pounds-force (932 kN )	12,550 horsepower (9,359 kW ) continuous; 13,437 horsepower (10,020 kW ) short term	—
Voith Maxima	—	—	Voith	2006–14	Diesel-hydraulic	Co'Co'	136 tonnes (150 short tons )	91,730 pounds-force (408 kN )	5,000 horsepower (3,728 kW ) continuous (Maxima 40CC)	Voith Maxima 40CC is the most powerful single-engine diesel-hydraulic locomotive ever built.
XA Triplex	Virginian Railway	700	Baldwin	1916	Steam	2-8-8-8-4	532 tonnes (586 short tons )	166,600 pounds-force (741 kN ) compound	—	Rebuilt into separate locomotives; Maximum speed approx. 10 mph.
Yellowstone	Northern Pacific, Duluth, Missabe & Iron Range Railway and Baltimore & Ohio	220-237 (DM&IR)	Baldwin Locomotive Works	1928-1945	Steam	2-8-8-4	566 tonnes (624 short tons )	140,093 pounds-force (623 kN )	6,250 horsepower (4,661 kW )	Figures are for the DM&IR Yellowstones, the largest and generally the most well-known of their type.

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A locomotive or engine is a rail transport vehicle that provides the motive power for a train. If a locomotive is capable of carrying a payload, it is usually rather referred to as a multiple unit, motor coach, railcar or power car; the use of these self-propelled vehicles is increasingly common for passenger trains, but rare for freight.

A switcher or shunter, is a type of small locomotive used for maneuvering railway vehicles over short distances. Switchers do not usually move trains over long distances, instead they typically assemble trains in order for another locomotive to take over. Switchers often operate in a railyard or make short transfer runs. They may serve as the primary motive power on short branch lines or switching and terminal railroads.

The American Locomotive Company was an American manufacturer of locomotives, diesel generators, steel, and tanks that operated from 1901 to 1969. The company was formed by the merger of seven smaller locomotive manufacturers and Schenectady Locomotive Engine Manufactory of Schenectady, New York. A subsidiary, American Locomotive Automobile Company, designed and manufactured automobiles under the Alco brand from 1905 to 1913. ALCO also produced nuclear reactors from 1954 to 1962.

An electric locomotive is a locomotive powered by electricity from overhead lines, a third rail or on-board energy storage such as a battery or a supercapacitor. Locomotives with on-board fuelled prime movers, such as diesel engines or gas turbines, are classed as diesel-electric or gas turbine-electric and not as electric locomotives, because the electric generator/motor combination serves only as a power transmission system.

A 2-8-8-4 steam locomotive, under the Whyte notation, has two leading wheels, two sets of eight driving wheels, and a four-wheel trailing truck. The type was generally named the Yellowstone, a name given it by the first owner, the Northern Pacific Railway, whose lines ran near Yellowstone National Park. Seventy-two Yellowstone-type locomotives were built for four U.S. railroads.

As used in mechanical engineering, the term tractive force can either refer to the total traction a vehicle exerts on a surface, or the amount of the total traction that is parallel to the direction of motion.

Under the Whyte notation for the classification of steam locomotives, 4-8-4 represents the wheel arrangement of four leading wheels on two axles, eight powered and coupled driving wheels on four axles and four trailing wheels on two axles. The type was first used by the Northern Pacific Railway, and initially named the Northern Pacific, but railfans and railroad employees have shortened the name since its introduction. It is most-commonly known as a Northern.

The AAR wheel arrangement system is a method of classifying locomotive wheel arrangements that was developed by the Association of American Railroads. Essentially a simplification of the European UIC classification, it is widely used in North America to describe diesel and electric locomotives. It is not used for steam locomotives, which use the Whyte notation instead.

The GE U36B was a four-axle 3,600 hp (2.7 MW) B-B diesel-electric locomotive produced by General Electric from 1969 to 1974. It was primarily used by the Seaboard Coast Line Railroad and its successors, although thirteen provided the power for the original Auto Train. The U36B was the last GE high-horsepower universal series locomotive.

EMD F-units are a line of diesel-electric locomotives produced between November 1939 and November 1960 by General Motors Electro-Motive Division and General Motors-Diesel Division. Final assembly for all F-units was at the GM-EMD plant at La Grange, Illinois, and the GMDD plant in London, Ontario. They were sold to railroads throughout the United States, Canada and Mexico, and a few were exported to Saudi Arabia. The term F-unit refers to the model numbers given to each successive type, all of which began with the letter F. The F originally meant "fourteen", as in 1,400 horsepower (1,000 kW), not "freight". Longer EMD E-units for passenger service had twin 900-horsepower (670 kW) diesel engines. The E meant "eighteen" as in 1,800 horsepower (1,300 kW). Similarly, for early model EMD switchers, S meant "six hundred" and N meant "nine hundred horsepower".

The Evolution Series is a line of diesel locomotives built by GE Transportation Systems, initially designed to meet the U.S. EPA's Tier 2 locomotive emissions standards that took effect in 2005. The first pre-production units were built in 2003. Evolution Series locomotives are equipped with either AC or DC traction motors, depending on the customer's preference. All are powered by the GE GEVO engine.

The Consolidation Line was a series of diesel-electric railway locomotive designs produced by Fairbanks-Morse and its Canadian licensee, the Canadian Locomotive Company. Railfans have dubbed these locomotives “C-liners”, however F-M referred to the models collectively as the C-Line. A combined total of 165 units were produced by F-M and the CLC between 1950 and 1955.

In rail transport, head-end power (HEP), also known as electric train supply (ETS), is the electrical power distribution system on a passenger train. The power source, usually a locomotive at the front or 'head' of a train, provides the electricity used for heating, lighting, electrical and other 'hotel' needs. The maritime equivalent is hotel electric power. A successful attempt by the London, Brighton and South Coast Railway in October 1881 to light the passenger cars on the London to Brighton route heralded the beginning of using electricity to light trains in the world.

The EMD GP9 is a four-axle diesel-electric locomotive built by General Motors' Electro-Motive Division between 1954 and 1959. The GP9 succeeded the GP7 as the second model of EMD's General Purpose (GP) line, incorporating a new sixteen-cylinder engine which generated 1,750 horsepower (1.30 MW). This locomotive type was offered both with and without control cabs; locomotives built without control cabs were called GP9B locomotives.

The ALCO RSD-15 is a diesel-electric locomotive built by the American Locomotive Company (ALCO) of Schenectady, New York between August 1956 and June 1960, during which time 75 locomotives were produced. The RSD-15 was powered by an ALCO 251 16-cylinder four-cycle V-type prime mover rated at 2,400 horsepower (1.79 MW); it superseded the almost identical ALCO 244-engined RSD-7, and was catalogued alongside the similar but smaller 1,800 hp (1.34 MW) RSD-12, powered by a 12-cylinder 251-model V-type diesel engine.

A hybrid train is a locomotive, railcar or train that uses an onboard rechargeable energy storage system (RESS), placed between the power source and the traction transmission system connected to the wheels. Since most diesel locomotives are diesel-electric, they have all the components of a series hybrid transmission except the storage battery, making this a relatively simple prospect.

<span class="mw-page-title-main">Victorian Railways H class</span>

The Victorian Railways H class was an express passenger steam locomotive operated by the Victorian Railways from 1941 to 1958. Intended to eliminate the use of double heading A2 class locomotives on The Overland services on the steeply graded Western line to Adelaide, wartime restrictions led to only one locomotive being built. Nicknamed Heavy Harry, H220 was the largest locomotive ever built in Australia and the largest non-articulated steam locomotive to run on Australian railways.

The China Railways HXD1 is an eight axle high power heavy freight twin unit locomotive of axle configuration Bo'Bo'+Bo'Bo'. Both the HXD1 and HXD2 double unit locomotives were designated DJ4, the HXD2 units being disambiguated DJ4-6000.

<span class="mw-page-title-main">China Railways HXD2</span> Class of Chinese electric locomotives

The HXD2 locomotives are a series of related locomotive classes built by CNR Datong Electric Locomotive and Alstom. The locomotives designs are based on the Alstom Prima electric locomotives, and are a product of a cooperation agreement signed between the two companies in 2004. All locomotives are intended for heavy freight work, including coal trains on the Datong Qinhuangdao line.

The Indian locomotive class WAG-12B is a class of 25 kV AC electric locomotives that was developed in 2017 by Alstom with technological collaboration with Indian Railways. The model name stands for broad gauge (W), Alternating Current (AC), Goods traffic (G) locomotive, 12,000 hp (12). They entered trial service in 2019. A total of 280 WAG-12B have been built at Electric Locomotive Factory, Madhepura, Bihar, India.

References

↑ NSWGR AD60 Class Beyer-Garratt Locos Locomotives International issue 132 August 2021 page 16
↑ Big Boy 4014 is back: UP restores, runs iconic train Railway Age May 8, 2019
↑ Union Pacific donates Challenger for overhaul Steam Railway issue 532 May 27, 2022 page 22
↑ Heavy Harry, H220 Newsrail April 1978 page 55
↑ "The N&W's Jawn Henry", https://www.american-rails.com. Retrieved 10 July 2018.
↑ "28·8 MW freight locomotive unveiled" . Railway Gazette International . 2020-08-04. Archived from the original on 2020-09-28. Retrieved 2023-01-04.
↑ "CRRC Zhuzhou unveils 28.8MW electric freight locomotive". International Railway Journal . 2020-08-04. Retrieved 2020-08-09.

External links

Steamlocomotive.com article regarding the largest steam locomotives archive at the Internet Archive Wayback Machine

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[1] NSWGR AD60 Class Beyer-Garratt Locos Locomotives International issue 132 August 2021 page 16

[2] Big Boy 4014 is back: UP restores, runs iconic train Railway Age May 8, 2019

[3] Union Pacific donates Challenger for overhaul Steam Railway issue 532 May 27, 2022 page 22

[4] Heavy Harry, H220 Newsrail April 1978 page 55

[5] "The N&W's Jawn Henry", https://www.american-rails.com. Retrieved 10 July 2018.

[6] "28·8 MW freight locomotive unveiled" . Railway Gazette International . 2020-08-04. Archived from the original on 2020-09-28. Retrieved 2023-01-04.

[7] "CRRC Zhuzhou unveils 28.8MW electric freight locomotive". International Railway Journal . 2020-08-04. Retrieved 2020-08-09.

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