The majority of trains in the 1940s were pulled by steam locomotives (some diesel locomotives had been introduced in the 1930s but they were not common on the mainlines). These were usually fueled with either coal or fuel oil. There were a few railroads using electric locomotives on specific sections of track (e.g. the Great Northern Railway over the Cascade Range in Washington state).
Diesel fuel for diesel-electric; wood,coal or havy oil for steamers; none for electrics.
The modern train runs on diesel fuel.
Depends on the train type. Steam trains and diesel trains use chemical energy stored in their fuel (coal or diesel) to create mechanical energy. Electrical trains use, well, electricity.
MAGNETS!
gas
yes it type of fuel
jet fuel
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I use a fuel pressure gauge.
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diesel/unleaded
Petrol
A type of "train" called a camel train.