Construction
When the Victorian Railways began to plan the electrification of the suburban rail network, they planned to include about 200 'excursion' cars, for use during special occasions or events, and when the main system required extra carriages to handle the load. When conversion of locomotive hauled cars into the "Swing Door" electric multiple unit trains occurred, the underframes were rendered surplus.
Instead of scrapping these, new bodies were fitted, and the carriages became first the APL series, then BPL's. Later, trials began for the BCPL series of passenger cars. In order to construct the carriages, the underframes had to be extended from 45 feet and 50 feet, to 58 feet.
Aside from class conversions and the creation of BCPL cars, as detailed below, the carriages more-or-less remained unchanged besides the fitting of vestibules in the late 1950s and electric lighting in the mid 60s.
Read more about this topic: PL Type Cars
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