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Roy.....a Very n i c e smooth video...isn't that amazing the trains engines can pull all that weight and a steel wheel to a steel track.......Many don't know that a diesel train engine merely generates electricity and that runs the large drive electric motors that move it down the tracks...Thanks for the great video too.
Yes did you know that the total surface area of all those steel wheels contacting the rails on a train that long is only the size of kids school desktop. Yes, the entire weight of that train is resting on an area of about 6 square feet!!!The Diese engines l turn a generator....the power from the generator....Runs the BIG Track motors !
Speed is regulated by a rheostat....like a dimmer for dash lites on a car.
https://www.quora.com/How-do-trains-run