to the upgrade of Long Rock Train & Maintenance Depot
An explanation - Mike Roach
The previous summers would have been similar but lets assume that this is a Saturday in June or July 1961. The train is the 10.55am Saturdays Only Kingsbridge to Paddington. The train would have arrived in its normal platform in Brent at 11.30am. 5573 would then have propelled its coaches out towards Newton Abbot over the crossover and onto the up main. It would then have worked its train westwards through the up platform out under the road bridge from which the photo was taken and into the up loop. The 11.15am Plymouth to Paddington arrived in the up platform and 5573 propelled its coaches out of the loop and on to the back of the Paddington train. Departure from Brent was scheduled at 11.45am and arrival at Paddington at 4.18pm. Many thanks to Mike Roach for this very detailed answer.