That time return looks odd, but it's not. In 1946-1948, NYC added back a few summer passenger trains on the CMB. Train 537 was a Friday-only short turn from Kingston to Stamford. There was no corresponding schedule for a return as a regular train, but it is most likely that they ran in reverse to Arkville and turned the engine for the rest of the return to Kingston. The return move would have been an extra train, which could be easily handled with one train order and Clearance Form A.
Stamford was open as a train order office and manual block station until after 537's scheduled arrival. The train order would simply read, "Engine 811 run extra Stamford to Kingston." The Clearance Form A would show "Clear Block." No other manual block stations were open between Stamford and Kingston, so that was all the authority needed for Extra 811 East from Stamford to Kingston.
I don't know if they brought the passenger cars back to Kingston, or left them at Stamford. Maximum speed for passenger trains on the CMB was 45 mph, for light engines 35 mph, and for engines running backward, 20 mph; unless otherwise restricted. Probably the fastest move would be with the train, for the highest speed after turning the engine at Arkville.
A corresponding eastward train, No. 538, ran from Stamford to Kingston on Sunday evenings. Trains 537 and 538 connected with West Shore trains 37 and 38 that ran from and to Weehawken. For a long time, they were known in Stamford as the "Husband's Train." The families came to hotels in the Stamford area for summer vacations. The fathers and husbands came up for weekend visits.
Gordon Davids