GCT turnaround for long-distance trains

looking at a thread on another site did the 20th Century and other LD trains come in on tk 40,41,42 to discharge passengers then use the upper loop to get to Mott Haven to be serviced, or did the just come into the 20's and then pulled out by a yard motor for servicing.
May I assume when they were brought back to puck up passengers it was a "simple" reverse move from MO?

My recollection from "being there" is that it and all LD trains arrived on the west end of the station tracks (the "arrival station") and made the loop to Mott Haven.