Billy, you are a young fellow, to judge by your photo. I'll give you a pass because of your age.
Steam engines are old school. Today's railroading relies a lot on processes. Old school railroading relies on learned skills and good judgment.
Skill and good judgement, supported by knowledge of air brakes and knowledge of locomotive mechanical operation, as well as knowing the railroad physical characteristics and the Operating Rules -- that's the entire answer to your question.
