RS-51, provided it runs on Saturday night, will follow the first westbound after 8 out of Deer Park. That's usually the slot they're given. If I were you just go to DP since you can definitely tell if it's going to run provided the headlights are on and power is on the west end of the DEF. You can usually get some good footage since they usually wait to line lock the switch clear, hence usually tying up the crossing.
The stone train is going to be sketchy for a bit, so don't bank every weekend for one. I know Dutch is good at informing people here on any potential stone runs and I usually get word of one Thurs/Fri from sources who shall remain anonymous.