How fast can trains go?
user
That depends on the kind of train, the length of the train, the density of the track, the grade, and the direction of the train.
assistant
What about coal trains?
user
I’m not sure what you mean by “coal trains”.
assistant
Oh, I mean trains pulled by a steam locomotive.
user
They can go anywhere from 50 miles per hour, up to 130.
assistant
How fast can trains go?
user
That depends on the kind of train, the length of the train, the density of the track, the grade, and the direction of the train.
assistant
What about coal trains?
user
I’m not sure what you mean by “coal trains”.
assistant
Oh, I mean trains pulled by a steam locomotive.
user
Ah, I didn’t know what you meant by “coal trains”, but those can go quite fast.  On a freight railroad line, the average speed is about 35 miles per hour, and is usually about half the speed of a passenger train.
assistant
How fast can trains go?