Great Northern boxcab (3 phase)

Great Northern Boxcab (3-Phase)
Three Great Northern boxcabs
Type and origin Power type Electric Builder GE and ALCO Serial number Alco: 45289, 45286–45288 GE: 2895, 2892–2894 Build date February–March 1909
Specifications Configuration: ​  •  AAR B-B  •  UIC Bo′Bo′ Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Wheel diameter 60 in (1.5 m) [1] Length 44 ft 2 in (13.46 m) Width 10 ft 0 in (3.05 m) Loco weight 230,000 lb (100,000 kg; 100 t) Electric system/s 6.6 kV, 25 Hz AC (3-Phase) Current pickup(s) Pantograph Traction motors 4 × GE-1506 Gear ratio 19/81
Performance figures Maximum speed 15 mph (24 km/h) Power output 1,500 hp (1,100 kW) Tractive effort: ​  • Starting 57,500 lbf (256 kN) at 25% adhesion [1]  • 1 hour 38,000 lbf (170 kN) [1]  • Continuous 34,800 lbf (155 kN) [1] Factor of adh. 25%
Career Operators Great Northern Railway Number in class 4 Numbers 5000–5003 Delivered 1909 Retired May 1927 Disposition All scrapped

The GN boxcab locomotives were the first electric locomotives purchased by the Great Northern Railway (GN) for use through the Cascade Tunnel. Four locomotives were supplied were built in February and March 1909 by the American Locomotive Company, and delivered in Pullman Green; they used electrical equipment from General Electric and weighed 115 short tons (104 t) each. ^{[2] [3]}

They were three-phase electric locomotives with specifications calling for 1,000 hp (750 kW), but the actual output was substantially greater at 1,500 hp (1,100 kW) each, as described by the consultant engineer Cary T. Hutchinson. ^[4] They had a B-B wheel arrangement. The GN numbered them 5000–5003 and they were used until May 1927, after which all were scrapped. ^[5]

Initially, three locomotives were coupled together and hauled trains at a constant speed of 15.7 mph (25.3 km/h), ^[6] but when larger trains required four locomotives the motors were concatenated (cascade control), so that the speed was halved to 7.8 mph (12.6 km/h) to avoid overloading the power supply. ^[4]

References

1. Manson, Arthur J. (1923). Railroad Electrification and the Electric Locomotive. New York, NY: Simmons-Boardman Publishing Corporation. ISBN   978-587167932-6. Refer to Table F, p.318-319, Line 8
2. "Electric Locomotives for the Great Northern". The Railroad Gazette. 46 (1): 120-122. 1909.
3. Haut, F.J.G. (1969). The History of the Electric Locomotive. London: George Allen and Unwin Ltd. ISBN   004-385042-1.
4. Hutchinson, Cary T. (1909). "The electric system of the Great Northern railway company at Cascade tunnel". Proceedings of the American Institute of Electrical Engineers. 28 (11): 1409–1447. doi:10.1109/PAIEE.1909.6660192. S2CID   51673934.
5. "GN Alco-GE 3-phase 5000s". The Great Northern Empire. 2005. Retrieved January 18, 2015.
6. American Railway Association, (Division V - Mechanical) (1922). Wright, Roy V.; Winter, Charles (eds.). Locomotive Cyclopedia of American Practice (6th ed.). New York: Simmons-Boardman Publishing. p. 901. OCLC   6201422.

• Keyes, Norman C. Jr.; Middleton, Kenneth R. (Autumn 1980). "The Great Northern Railway Company: All-Time Locomotive Roster, 1861–1970". Railroad History . 143 (143). Boston, Mass.: Railway and Locomotive Historical Society: 117. ISSN   0090-7847. JSTOR   43523930.