OK, so a NB train would stop, and back the cars for the dairy on to the track between the NB main, and the track right next to the Milton Oil Co., the switch engine, if it’s waiting by the freight, what ever direction it is facing, would either back up to, or pull forward to, the cars, after getting clearance to enter the NB main, pick up the cars, and pull them, once again, after clearance to the NB main, and pull them down the spur/ladder track, to the dairy, then shove into the dairy. If the switcher is on the track that is in front of Milton Oil, he could pull forward/back, to the spur / ladder track, then reverse direction, and getting clearance to enter the NB main, pick up the cars, and pull forward/reverse, and pull the cars down the spur to the dairy.
A SB train could drop cars for the dairy, by backing on to the 2nd track just east of the NB, after getting clearance to do so. The switcher, once again, no matter which way it’s facing, could use the run-a-round, and push the cars SB, after getting clearance to enter the NB track, and then pull the cars on to the spur / ladder track, to the tail track, and shove into the dairy.
So from either NB or SB, cars could be droped for the dairy.
Easier to do, than explain, I think.
Mike.
EDIT: I don’t have the real world experience like Charlie, above, or another guy on here, Brakie (Larry), I’m just looking at the track plan on your link, and seeing what would work.