Internal combustion locomotive

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An internal combustion locomotive is a type of railway locomotive that produces its pulling power using an internal combustion engine. These locomotives are fuelled by burning fossil fuels, most commonly oil or gasoline (UK: petrol), to produce rotational power which is transmitted to the locomotive's driving wheels by various direct or indirect transmission mechanisms. The fuel is carried on the locomotive.

Contents

Kerosene

The 1887 Daimler draisine Die Daimler Motor-Draisine erstmals im Sommer 1887 zwischen Esslingen und Kirchheim-Teck erprobt.jpg
The 1887 Daimler draisine

Kerosene locomotives use kerosene as the fuel. They were the world's first oil locomotives, preceding diesel and other oil locomotives by some years.

The first known kerosene rail vehicle was a draisine built by Gottlieb Daimler in 1887, [1] for the Daimler Paraffin Railway. This was not technically a locomotive as it carried passengers and did not haul other items of rolling stock.

Hornsby kerosene locomotive "Lachesis" of 1896 Hornsby-Akroyd locomotive of RAR Woolwich.jpg
Hornsby kerosene locomotive "Lachesis" of 1896

A kerosene locomotive was built in 1894 by the Priestman Brothers of Kingston upon Hull for use on Hull docks. This locomotive was built using a 12 hp double-acting marine type engine, running at 300 rpm, mounted on a 4-wheel wagon chassis. It was only able to haul one loaded wagon at a time, due to its low power output, and was not a great success. [2] The first successful kerosene locomotive was "Lachesis" built by Richard Hornsby & Sons Ltd. and delivered to Woolwich Arsenal railway in 1896. The company built a series of kerosene locomotives between 1896 and 1903, for use by the British military.

Benzene

Benzine-fueled locomotive built by Deutz Deutz benzine locomotive.png
Benzine-fueled locomotive built by Deutz

Benzene locomotives have an internal combustion engines that use benzene as fuel. There were a number of commercial manufacturers of Benzene locomotives operating in the 1890s and 1900s. Deutz produced a successful locomotive in the late 1890s, based on a prototype for a manganese mine in Giessen. [3] In the early 1900s, Oberursel of Frankfurt sold locomotives for mining and tunnelling operations. [4] They did not see widespread use after the 1900s, being superseded by petrol and diesel locomotives.

Naphthalene

Petrol

The 1902 Maudslay Petrol Locomotive 1904 Maudsley Petrol Locomotive (de-moire filtered).jpg
The 1902 Maudslay Petrol Locomotive

Petrol locomotives (US: gasoline locomotives) use petrol as their fuel. The earliest gasoline locomotive in the western United States was built by the Best Manufacturing Company in 1891 for San Jose and Alum Rock Railroad. It was only a limited success and was returned to Best in 1892. [5]

In the United Kingdom, the first commercially successful petrol locomotive[ dubious discuss ] was a petrol-mechanical locomotive built by the Maudslay Motor Company in 1902, for the Deptford Cattle Market in London. It was an 80 hp locomotive using a 3-cylinder vertical petrol engine, with a two speed mechanical gearbox. The second locomotive was built by F.C. Blake of Kew in January 1903 for the Richmond Main Sewerage Board. [6] [7] [2]

Although a number of one-off and small classes of petrol locomotives were built before 1914, it was the First World War that saw the introduction of mass-produced locomotives. In 1916, Motor Rail started production of its "Simplex" petrol locomotives, with 20-40 hp motors and 4-wheel mechanical transmission began to be used on 600 mm (1 ft 11+58 in) gauge trench railways on the Western Front. [8] The War Department also ordered large petrol-electric locomotives from Dick, Kerr & Co. and British Westinghouse, which used a 45 hp Dorman 4JO four-cylinder petrol engine driving a 30 kW DC generator at 1,000 rpm. [9] In all, 1,216 petrol-mechanical and 42 petrol-electric locomotives were used in service by the Allied Forces. Many of these petrol locomotives were sold off as surplus after the end of hostilities, and found work on small industrial railways. Motor Rail continued to develop and manufacture and develop the design, for several decades. [8]

Petrol-mechanical

The most common type[ citation needed ] of petrol locomotive are petrol-mechanical locomotives, which use mechanical transmission. The earliest examples of these locomotives used a plate or cone [10] clutch and mechanical gear-box driving the main axle either directly, [11] via a chain drives [8] or using bevel gears. [12]

Petrol–electric

The interior of a Petrol-electric locomotive showing the engine and dynamo Interior of a Petrol-electric locomotive.png
The interior of a Petrol-electric locomotive showing the engine and dynamo

Petrol–electric locomotives are petrol locomotives that use electric transmission to deliver the power output of the engine to the driving wheels. This avoids the need for gearboxes by converting the rotary mechanical force of the engine into electrical energy by a dynamo, and then powering the wheels by multi-speed electric traction motors. This allows for smoother acceleration as it avoids the need for gear changes, and the power output can be divided amongst multiple motors, which gives greater traction control. However the generating equipment is more expensive, heavier, and often more complex to maintain than mechanical transmission. [13]

A notable early petrol–electric locomotive was built in 1913 for the Minneapolis, St. Paul, Rochester and Dubuque Electric Traction Company. It weighed 60 tons, generated 350 hp and drove through a pair of bogies in a Bo-Bo arrangement. [14] [15]

Diesel

KE65 diesel locomotive of the Kinuura Rinkai Railway Kinuura Rinkai KE65.jpg
KE65 diesel locomotive of the Kinuura Rinkai Railway

Diesel locomotives are powered by diesel engines. In the early days of Diesel propulsion development, various transmission systems were employed with varying degrees of success, with electric transmission proving to be the most popular.

Diesel-mechanical

Schematic illustration of a diesel-mechanical locomotive DieselMechanicalLocomotiveSchematic.svg
Schematic illustration of a diesel-mechanical locomotive

A diesel–mechanical locomotive uses mechanical transmission to transfer power to the wheels. This type of transmission is generally limited to low-powered, low speed shunting (switching) locomotives, lightweight multiple units and self-propelled railcars. The earliest diesel locomotives were diesel-mechanical.

The mechanical transmissions used for railroad propulsion are generally more complex and much more robust than standard-road versions. There is usually a fluid coupling interposed between the engine and gearbox, and the gearbox is often of the epicyclic (planetary) type to permit shifting while under load. Various systems have been devised to minimise the break in transmission during gear changing; e.g., the S.S.S. (synchro-self-shifting) gearbox used by Hudswell Clarke. Diesel–mechanical propulsion is limited by the difficulty of building a reasonably sized transmission capable of coping with the power and torque required to move a heavy train.

In 1906, Rudolf Diesel, Adolf Klose and the steam and diesel engine manufacturer Gebrüder Sulzer founded Diesel-Sulzer-Klose GmbH to manufacture diesel-powered locomotives. The Prussian State Railways ordered a diesel locomotive from the company in 1909. The world's first diesel-powered locomotive (a diesel-mechanical locomotive) was operated in the summer of 1912 on the Winterthur–Romanshorn railway in Switzerland, but was not a commercial success. [16] The locomotive weight was 95 tonnes and the power was 883 kW with a maximum speed of 100 km/h. [17] Small numbers of prototype diesel locomotives were produced in a number of countries through the mid-1920s.

Diesel-electric

Schematic diagram of diesel electric locomotive DieselElectricLocomotiveSchematic.svg
Schematic diagram of diesel electric locomotive

Diesel–electric locomotives are diesel locomotives using electric transmission. In this arrangement, the diesel engine drives either an electrical DC generator (generally, less than 3,000 horsepower (2,200 kW) net for traction), or an electrical AC alternator-rectifier (generally 3,000 horsepower (2,200 kW) net or more for traction), the output of which provides power to the traction motors that drive the locomotive. There is no mechanical connection between the diesel engine and the wheels. The vast majority of diesel locomotives today are diesel-electric.

The important components of diesel–electric propulsion are the diesel engine (also known as the prime mover), the main generator/alternator-rectifier, traction motors (usually with four or six axles), and a control system consisting of the engine governor and electrical or electronic components, including switchgear, rectifiers and other components, which control or modify the electrical supply to the traction motors. In the most elementary case, the generator may be directly connected to the motors with only very simple switchgear.

Originally, the traction motors and generator were DC machines. Following the development of high-capacity silicon rectifiers in the 1960s, the DC generator was replaced by an alternator using a diode bridge to convert its output to DC. This advance greatly improved locomotive reliability and decreased generator maintenance costs by elimination of the commutator and brushes in the generator. Elimination of the brushes and commutator, in turn, disposed of the possibility of a particularly destructive event called a flashover, which could result in immediate generator failure and, in some cases, start an engine room fire.

World's first useful diesel locomotive (a diesel-electric locomotive) for long distances SZD Eel2, 1924 in Kyiv Teplovoz Eel2 (2).jpg
World's first useful diesel locomotive (a diesel-electric locomotive) for long distances SŽD Eel2, 1924 in Kyiv

In the late 1980s, the development of high-power variable-frequency/variable-voltage (VVVF) drives, or "traction inverters," has allowed the use of polyphase AC traction motors, thus also eliminating the motor commutator and brushes. The result is a more efficient and reliable drive that requires relatively little maintenance and is better able to cope with overload conditions that often destroyed the older types of motors.

In 1914, Hermann Lemp, a General Electric electrical engineer, developed and patented a reliable direct current electrical control system (subsequent improvements were also patented by Lemp). [18] Lemp's design used a single lever to control both engine and generator in a coordinated fashion, and was the prototype for all diesel–electric locomotive control. In 1917–18, GE produced three experimental diesel–electric locomotives using Lemp's control design. [19] In 1924, a diesel-electric locomotive (Eel2 original number Юэ 001/Yu-e 001) started operations. It had been designed by a team led by Yuri Lomonosov and built 1923–1924 by Maschinenfabrik Esslingen in Germany. It had 5 driving axles (1'E1'). After several test rides, it hauled trains for almost three decades from 1925 to 1954. [20] It was the world's first functional diesel locomotive.

Diesel-hydraulic

A German DB Class V 200 diesel-hydraulic locomotive at Technikmuseum, Berlin V 200 Technikmuseum Berlin.jpg
A German DB Class V 200 diesel-hydraulic locomotive at Technikmuseum, Berlin

Diesel–hydraulic locomotives are diesel locomotives using hydraulic transmission. In this arrangement, they use one or more torque converters, in combination with gears, with a mechanical final drive to convey the power from the diesel engine to the wheels.

Hydrokinetic transmission (also called hydrodynamic transmission) uses a torque converter. A torque converter consists of three main parts, two of which rotate, and one (the stator) that has a lock preventing backwards rotation and adding output torque by redirecting the oil flow at low output RPM. All three main parts are sealed in an oil-filled housing. To match engine speed to load speed over the entire speed range of a locomotive some additional method is required to give sufficient range. One method is to follow the torque converter with a mechanical gearbox which switches ratios automatically, similar to an automatic transmission on a car. Another method is to provide several torque converters each with a range of variability covering part of the total required; all the torque converters are mechanically connected all the time, and the appropriate one for the speed range required is selected by filling it with oil and draining the others. The filling and draining is carried out with the transmission under load, and results in very smooth range changes with no break in the transmitted power.

The main worldwide user of main-line hydraulic transmissions was the Federal Republic of Germany, with designs including the 1950s DB class V 200, and the 1960 and 1970s DB Class V 160 family. British Rail introduced a number of diesel hydraulic designs during it 1955 Modernisation Plan, initially license built versions of German designs. In Spain RENFE used high power to weight ratio twin engined German designs to haul high speed trains from the 1960s to 1990s. (see RENFE Classes 340, 350, 352, 353, 354).

Hydrostatic drive systems have also been applied to rail use, for example 350 to 750 hp (260 to 560 kW) shunting locomotives by CMI Group (Belgium), [21] and 4 to 12 tonne 35 to 58 kW (47 to 78 hp) industrial locomotives by Atlas Copco subsidiary GIA. [22] Hydrostatic drives are also used in railway maintenance machines such as tampers and rail grinders. [23]

Gas turbine

A 44-ton 1-B-1 experimental gas turbine locomotive designed by R. Tom Sawyer and built in 1952 for testing by the U.S. Army Transportation Corps. Gas turbine locomotive 1149.jpg
A 44-ton 1-B-1 experimental gas turbine locomotive designed by R. Tom Sawyer and built in 1952 for testing by the U.S. Army Transportation Corps.

A gas turbine locomotive is an internal combustion engine locomotive consisting of a gas turbine. ICE engines require a transmission to power the wheels. The engine must be allowed to continue to run when the locomotive is stopped.

Gas turbine-mechanical locomotives use a mechanical transmission to deliver the power output of gas turbines to the wheels. A gas turbine locomotive was patented in 1861 by Marc Antoine Francois Mennons (British patent no. 1633). [24] There is no evidence that the locomotive was actually built but the design includes the essential features of gas turbine locomotives built in the 20th century, including compressor, combustion chamber, turbine and air pre-heater. In 1952, Renault delivered a prototype four-axle 1,150 hp gas-turbine-mechanical locomotive fitted with the Pescara "free turbine" gas- and compressed-air producing system, rather than a co-axial multi-stage compressor integral to the turbine. This model was succeeded by a pair of six-axle 2,400 hp locomotives with two turbines and Pescara feeds in 1959. Several similar locomotives were built in USSR by Kharkov Locomotive Works. [25]

UP 18, a gas turbine-electric locomotive preserved at the Illinois Railway Museum. Union Pacific 18.jpg
UP 18, a gas turbine-electric locomotive preserved at the Illinois Railway Museum.

Gas turbine-electric locomotives, use a gas turbine to drive an electrical generator or alternator which produced electric current powers the traction motor which drive the wheels. In 1939 the Swiss Federal Railways ordered Am 4/6, a GTEL with a 1,620 kW (2,170 hp) of maximum engine power from Brown Boveri. It was completed in 1941, and then underwent testing before entering regular service. The Am 4/6 was the first gas turbine – electric locomotive. British Rail 18000 was built by Brown Boveri and delivered in 1949. British Rail 18100 was built by Metropolitan-Vickers and delivered in 1951. A third locomotive, the British Rail GT3, was constructed in 1961. Union Pacific ran a large fleet of turbine-powered freight locomotives starting in the 1950s. [26] These were widely used on long-haul routes, and were cost-effective despite their poor fuel economy due to their use of "leftover" fuels from the petroleum industry. At their height the railroad estimated that they powered about 10% of Union Pacific's freight trains, a much wider use than any other example of this class.

A gas turbine offers some advantages over a piston engine. There are few moving parts, decreasing the need for lubrication and potentially reducing maintenance costs, and the power-to-weight ratio is much higher. A turbine of a given power output is also physically smaller than an equally powerful piston engine, allowing a locomotive to be very powerful without being inordinately large. However, a turbine's power output and efficiency both drop dramatically with rotational speed, unlike a piston engine, which has a comparatively flat power curve. This makes GTEL systems useful primarily for long-distance high-speed runs. Additional problems with gas turbine-electric locomotives included that they were very noisy. [27]

Wood Gas Generation

Some locomotives, mainly in France and Italy, ran on a Wood gas generator. [28] [ self-published source ] [29] [ user-generated source ]

Related Research Articles

<span class="mw-page-title-main">Locomotive</span> Self-propelled railway vehicle

A locomotive 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 trains.

<span class="mw-page-title-main">Diesel locomotive</span> Locomotive powered by a diesel engine

A diesel locomotive is a type of railway locomotive in which the power source is a diesel engine. Several types of diesel locomotives have been developed, differing mainly in the means by which mechanical power is conveyed to the driving wheels. The most common are diesel–electric locomotives and diesel–hydraulic.

<span class="mw-page-title-main">Dynamic braking</span> Use of the traction motors as generators when slowing a vehicle

Dynamic braking is the use of an electric traction motor as a generator when slowing a vehicle such as an electric or diesel-electric locomotive. It is termed "rheostatic" if the generated electrical power is dissipated as heat in brake grid resistors, and "regenerative" if the power is returned to the supply line. Dynamic braking reduces wear on friction-based braking components, and regeneration lowers net energy consumption. Dynamic braking may also be used on railcars with multiple units, light rail vehicles, electric trams, trolleybuses, and electric and hybrid electric automobiles.

<span class="mw-page-title-main">Diesel–electric powertrain</span> Propulsion system for vehicles

A diesel–electric transmission, or diesel–electric powertrain, is a transmission system powered by diesel engines for vehicles in road, rail, and marine transport. Diesel–electric transmission is similar to petrol–electric transmission, which is powered by petrol engines.

<span class="mw-page-title-main">Traction motor</span> An electric motor for vehicle propulsion

A traction motor is an electric motor used for propulsion of a vehicle, such as locomotives, electric or hydrogen vehicles, or electric multiple unit trains.

<span class="mw-page-title-main">Motor–generator</span> Device for converting electrical power to another form

A motor–generator is a device for converting electrical power to another form. Motor–generator sets are used to convert frequency, voltage, or phase of power. They may also be used to isolate electrical loads from the electrical power supply line. Large motor–generators were widely used to convert industrial amounts of power while smaller motor–generators were used to convert battery power to higher DC voltages.

<span class="mw-page-title-main">British Rail 18000</span>

British Rail 18000 was a prototype mainline gas turbine–electric locomotive built for British Railways in 1949 by Brown, Boveri & Cie. An earlier gas-turbine locomotive, 18100, had been ordered from Metropolitan-Vickers by the Great Western Railway but construction was delayed due to World War II; a second, 18000, was thus ordered from Switzerland in 1946. It spent its working life on the Western Region of British Railways, operating express passenger services from Paddington station, London.

<span class="mw-page-title-main">Gas turbine locomotive</span> Type of railway locomotive

A gas turbine locomotive is a type of railway locomotive in which the prime mover is a gas turbine. Several types of gas turbine locomotive have been developed, differing mainly in the means by which mechanical power is conveyed to the driving wheels (drivers). A gas turbine train typically consists of two power cars, and one or more intermediate passenger cars.

<span class="mw-page-title-main">Steam turbine locomotive</span> Locomotive using a steam turbine

A steam turbine locomotive was a steam locomotive which transmitted steam power to the wheels via a steam turbine. Numerous attempts at this type of locomotive were made, mostly without success. In the 1930s this type of locomotive was seen as a way to both revitalize steam power and challenge the diesel locomotives then being introduced.

<span class="mw-page-title-main">British Rail 18100</span>

British Rail 18100 was a prototype main line gas turbine–electric locomotive built for British Railways in 1951 by Metropolitan-Vickers, Manchester. It had, however, been ordered by the Great Western Railway in the 1940s, but construction was delayed due to World War II. It spent its working life on the Western Region of British Railways, operating express passenger services from Paddington station, London.

<span class="mw-page-title-main">Fluid coupling</span> Device used to transmit rotating mechanical power

A fluid coupling or hydraulic coupling is a hydrodynamic or 'hydrokinetic' device used to transmit rotating mechanical power. It has been used in automobile transmissions as an alternative to a mechanical clutch. It also has widespread application in marine and industrial machine drives, where variable speed operation and controlled start-up without shock loading of the power transmission system is essential.

<span class="mw-page-title-main">British Rail 10100</span> Early diesel railroad locomotive prototype

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Hermann Lemp born: Heinrich Joseph Hermann Lemp was a Swiss-American electrical engineer; he is credited as the inventor of the modern system of diesel electric traction co-ordination and control.

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<span class="mw-page-title-main">SBB-CFF-FFS Am 4/6 1101</span>

Am 4/6 1101 was the world's first gas turbine–electric locomotive. The locomotive was ordered by the Swiss Federal Railways (SBB-CFF-FFS) from the Swiss Locomotive and Machine Works (SLM) and Brown, Boveri & Cie (BBC) in 1939. The locomotive was delivered in 1941 and was in use on railroads in Switzerland, France and Germany until 1954.

<span class="mw-page-title-main">Prime mover (locomotive)</span> Main power source in a locomotive

In engineering, a prime mover is an engine that converts chemical energy of a fuel into useful work. In a locomotive, the prime mover is thus the source of power for its propulsion. In an engine-generator set, the engine is the prime mover, as distinct from the generator.

The Paxman Hi-Dyne engine was a form of experimental diesel engine developed for rail transport use by the British engine makers Paxman of Colchester. They used variable supercharging to give a constant power output across their speed range.

<span class="mw-page-title-main">Drivetrain</span> Group of components that deliver power to the driving wheels

A drivetrain or transmission system, is the group of components that deliver mechanical power from the prime mover to the driven components. In automotive engineering, the drivetrain is the components of a motor vehicle that deliver power to the drive wheels. This excludes the engine or motor that generates the power. In marine applications, the drive shaft will drive a propeller, thruster, or waterjet rather than a drive axle, while the actual engine might be similar to an automotive engine. Other machinery, equipment and vehicles may also use a drivetrain to deliver power from the engine(s) to the driven components.

<span class="mw-page-title-main">Turbine–electric powertrain</span> Propulsion method using hot gas rotor to generate current for traction motors

A turbine–electric transmission system includes a turboshaft gas turbine connected to an electrical generator, creating electricity that powers electric traction motors. No clutch is required.

Petrol–electric transmission or gasoline–electric transmission or gas–electric transmission is a transmission system for vehicles powered by petrol engines. Petrol–electric transmission was used for a variety of applications in road, rail, and marine transport, in the early 20th century. After World War I, it was largely superseded by diesel–electric transmission, a similar transmission system used for diesel engines; but petrol–electric has become popular again in modern hybrid electric vehicles.

References

  1. Winkler, Thomas. "Daimler Motorwagen".
  2. 1 2 Webb, Brian (1973). The British Internal Combustion Locomotive 1894–1940. David & Charles. ISBN   0715361155.
  3. International Railway Congress Association (1899). "A Benzine Locomotive for Use in Mines and on Country Lines". Bulletin of the International Railway Congress Association [English Edition]. p. 276.
  4. A Benzine Locomotive. 1904.{{cite book}}: |work= ignored (help)
  5. Quine, Dan (November 2024). "The Railroad Equipment of the Yellow Aster Gold Mine Part 1: The Locomotives". Narrow Gauge and Short Line Gazette . Vol. 50, no. 5.
  6. "Gasoline locomotives". Time. 28 September 1925. Archived from the original on November 18, 2011. Retrieved 1 January 2012.
  7. "Direct drive gasoline locomotives". Yardlimit.railfan.net. Retrieved 1 January 2012.
  8. 1 2 3 Farebrother, Martin J. B.; Farebrother, Joan S. (30 October 2018). Narrow Gauge in the Somme Sector: Before, During & After the First World War. Pen and Sword. ISBN   9781473887657.
  9. "Locomotive Notes and News". The Model Engineer: 225–226. 3 April 1919.
  10. "Saunderson's Light Petrol Locomotive". The Locomotive. 15 March 1912. p. 62.
  11. "Petrol locomotives for Standard and Narrow Gauge Rlys". The Railway Magazine. pp. 370–376.
  12. "The Petrol Locomotive". Dun's International Review. January 1921. p. 143.
  13. Walmsley, R. Mullineux (1921). "Electricity in the Service of Man". pp. 1628–1631.
  14. Duffy 2003, p. 157.
  15. Walmsley, R. Mullineux (1921). Electricity in the Service of Man. pp. 1628–1631.
  16. Churella 1998, p. 12.
  17. Glatte, Wolfgang (1993). Deutsches Lok-Archiv: Diesellokomotiven 4. Auflage. Berlin: Transpress. ISBN   3-344-70767-1.
  18. Lemp, Hermann. US Patent No. 1,154,785, filed April 8, 1914, and issued September 28, 1915. Accessed via Google Patent Search at: US Patent #1,154,785 on February 8, 2007.
  19. Pinkepank 1973 , pp. 139–141
  20. Russian page on Э-эл2
  21. "Shunting locomotives", www.cmigroupe.com, archived from the original on 30 September 2016, retrieved 2 December 2017
  22. "Locomotives", www.gia.se, archived from the original on 2014-03-30, retrieved 2 December 2017
  23. Solomon, Brian (2001), Railway Maintenance Equipment: The Men and Machines That Keep the Railroads Running, Voyager Press, pp. 78, 96, ISBN   0760309752
  24. "Espacenet - Original document".
  25. "Archived copy". Archived from the original on 2 December 2017. Retrieved 2 December 2017.{{cite web}}: CS1 maint: archived copy as title (link)
  26. "Gas Turbine Locomotive" Popular Mechanics, July 1949, cutaway drawing of development by GE for Union Pacific
  27. "Rails and Gas Turbines". Archived from the original on 22 April 2016. Retrieved 12 April 2016.
  28. "Wood-Gas Vehicles". Archived from the original on 14 March 2023. Retrieved 28 July 2023.
  29. "Wood-Gas Vehicles | PDF | Gasification | Engines". Archived from the original on 28 July 2023. Retrieved 28 July 2023.

Bibliography