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D72 QUAD SET 1/2 END COACH 1
In 1922 the GNR started building articulated coach sets for their Londonf suburban lines. These were 4 coach sets(quadruple), and building continued into LNER days. Various companies were used to build these coaches.
The ex GER suburban lines also needed new coaches, so a 5 coach set(quintuple) was designed, using some of the same coaches as those for the GNR lines, but with 2 different brake end coaches.
All these coaches were built with shorter compartments than mainline coaxches, and were intended for maximum usage. One consequence of this was overloading and damaged underframes. These were strengthened, and tests were also tried using a longer 8ft 6in bogie instead of the 8ft bogie. Plans were also drawn up for conversion to EMUs, but none were converted.
These coaches lasted in service up till electrification of the lines in 1960, and some from both 4 coach and 5 coach sets were transferred to other lines. The final ones were withdrawn by 1966.