Reply to "Big Boy #4014 moves under power for the first time in over 50 years • The UP is bringing out the 4014, see schedule 🚂"

Chuck Sartor posted:

So the whole train would brake in emergency, the diesel would have it's brakes applied and still pushing?

Yes, that is EXACTLY what happened! There is even video to prove it.

I know you can't control the diesels' brakes from the steamer control stand,

That is wrong, as the independent air is also MU'ed to the trailing MU'ed diesel units! Again, you don't know what you are talking about.

so you are telling me there was no over-ride safety that would throttle the diesel down unless it was done manually?

Correct! However, the NKP 765 group have since modified their EMD supplied Diesel MU Control Box with PC protection, at the request of the Norfolk Southern Mechanical Dept..