DET760,
Relay crews worked out of both Collinwood and Linndale.
They moved fresh power to outlying locations and power
needing work to the engine houses. These were "short" crews,
usually consisting of Engineer, Fireman, and Brakeman.
Cleveland territory had several seniority districts: Lake (Erie) Div., Ohio
Div.Road, Ohio Div. Yard, Toledo (East) Div., Cleveland Div. Road, Cleveland Yard - East, Cleveland Yard - West, and Cleveland Union Terminal. From the 1940's on, various seniority districts and rosters were merged as operating conditions changed.
Relay crews could make multiple trips within a single tour of duty. Pay
scale would differ if they were road crews or yard crews. Penalty
payments would have been involved if a crew did the work of another seniority district.
After Linndale was closed and the CUT electrification discontinued, all
NYC power was dispatched out of Collinwood. Passenger trains which ran through Cleveland would change power at Collinwood if required with no relay crew involved. For trains originating or terminating at CUT or for the CUT switchers, relay crews would take the power to Collinwood if it was not schedulled for an outbound train.
After the PC merger, the PRR engine house at Kinsman St. was
closed and the work came to Collinwood. For example, relay crews would
take fresh power down to the Whiskey Island Ore Dock Yard, or to Motor
Yard for BD-3.
Hope this helps.