The Southern Railway (SR) gave the designations 6 PUL, 6 CITY and 6 PAN to electric multiple units built to work the routes between London and Brighton, West Worthing and Eastbourne.
Coach numbers 11001 and 11002 were prototype driving motor brake vehicles for the mainline stock that was being developed for the London to Brighton electrification.
Both were introduced in October 1931, and ran with three trailers converted from former London and South Western Railway carriages as unit number 2001.
This was part of the general withdrawal of Pullman and other restaurant and dining cars from railway stock during World War II.
Number 264 is part of the Venice Simplon Orient Express fleet, working charter trains on the main line, while 278 is at Carnforth under private ownership.
The underframes of several PUL and PAN unit carriages were reused by the engineering department as long-welded rail carriers and crane runners.