If a freight headed locomotive-first up the PSH spur, it would branch westbound off the spur south of the power house and head to the stub. This stub track had a 10-car capacity.
Then a back-up move eastbound onto the trestle, cars first.
When emptied, the locomotive headed west to the stub, then reverse and back the train westbound off the PSH spur and out onto the main.
Nose in . . . . back out!
PSH had no means to turn a locomotive nor did it have a "run-around" track.
Same with passenger trains. They nosed into the station, discharged visitors, then backed out onto the main and headed to Ronkonkoma to run the engine around the train and layup for the return trip. Then, backing up the spur to the station, it would pick up passengers, then nose out westbound for the return trip to Jamaica.
Dave