British Rail Class 445 and 446
4PEP unit No.4002 in the sidings at Wimbledon depot
In service	1971–1980
Manufacturer	BREL York
Family name	1972 design (PEP)
Number built	2 Class 445, 1 Class 446
Formation	2/4 cars per trainset
Capacity	280 (445) 136 (446)
Operator(s)	British Rail
Specifications
Maximum speed	75 mph (121 km/h)
Electric system(s)	750V dc third rail
Track gauge	Standard

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).

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