On most steep grades in the U.S., train crews set up retainers in so many cars on the head end of a consist. Without going into a long technical discussion, retainers keep the brakes on those cars partially applied, so the engineer can recharge the rest of the train.
MSTS doesn't have that capability, and I have had runaway problems with heavies on Marias. My answer? I set up the hand brakes on the first 5 to 10 cars at the top of the grade past Spotted Robe, and kick them off at the bottom. For realism, I stop the train to do this. Works wonders. Anyone else tried it?
de N4JNM former KC6YJN
JOhn Oldrailfan - Railfan means anything on rails! Trains Trolleys Rollercoasters - you name it.