British Rail Classes 445 and 446

The PEP Stock were prototype electric multiple units used on British Rail's Southern Region during the early 1970s. They were forerunners of the BR "Second Generation" electric multiple unit fleet. Three units were built, one two-car unit (2001), and two four-car units (4001/4002). Under TOPS, they were allocated Classes 445 (4PEP) and 446 (2PEP).