The New Haven's trains also used Mott Haven until I think sometime in the late 50's. Dining and sleeping cars were serviced and stocked there. After the New Haven stopped using Mott Haven sleeping cars were poled to New Haven in the morning usually on train 66 and returned from New Haven that same afternoon on 83. Coaches did not need stocking nor the extensive service that sleepers and diners needed so they were generally kept at Grand Central Terminal for a later train. After Mott Haven was no longer used by the New Haven a couple of trains were poled to Stamford to get the cars out of the way, train 365 poled to Stamford and the equipment poled back to GCT in the afternoon for 386. The vast majority of the cars that were serviced in New Haven were simply put on a train to either deadhead or be used in service to Grand Central Terminal before making the trip to Boston. During the 60's the trains became fewer and shorter and servicing the cars at Grand Central Terminal became easier. During the 60's major repairs (what took place that is) were performed mostly at Boston, New Haven and Springfield plus Stamford for the MU's.
Noel Weaver