I'm assuming the questioner is American so using "engineer" as = "driver" in the UK.
A thorough knowledge of the machine itself - how it works etc., how to prepare, fire and drive it at its most efficient for the required speeds, train weights & track conditions.
A thorough knowledge of the particular railway's operating & safety rules & procedures; and of its route.
Good physical health including good eyesight.
Anything else? Oh yes - knowing the difference between a "train" and a "locomotive" (or "engine") would be a good start!
Trevithick, a british engineer built the first steam locomotive in 1804
A train that runs on steam. But first you need the coal and fire and shovel.
to take on water
Edward Pease built the first public railway that used a steam locomotive, the Stockton & Darlington Railway. The chief engineer for this line and its train was George Stephenson, a self-taught engineer and the accepted "founder" of modern railways.
Engineer operates the engine of a train. (the driver) Conductor is the Boss of the train.
Steam train translates as Dampflokomotive.
A Steam Train Passes was created in 1974.
The first steam train was called the rocket.
A railroad engineer, locomotive engineer, train operator or engine driver
steam train
A steam train is used for getting material over countries.
there is no smoke its a steam train