Vehicles {train, railroad}| {railroad train} can run on tracks.
force
Locomotives can use diesel engines or diesel-electric engines. Electric trains need a third rail, covered by insulator or buried in ground. Train shoe rides on third rail. Overhead wires can supply electricity. Arm reaches up from trolley to roller that rides on electric cable.
traction
Friction {traction, track} between rails and locomotive wheels pushes train.
grade
Track has angle {grade, track} to horizontal, which must be low enough for good traction.
Practical Affairs>Machine>Transportation>Vehicle>Train
7-Machine-Transportation-Vehicle-Train
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Date Modified: 2022.0224