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The SECR built these push pull sets using existing 6 wheel coaches, they had inherited from the LCDR. There were many varations, but this 3 coach set was more common and 'standard' than others.
They survived into the 20s on the Southern Railway, being used at both ends of the SECR territory.
Originally P class locos were used but others were also used.
The set composed a 5 compartment third class a 4 compartment first with one third class compartment, and a 3 compartment brake third coach with driver compartment.