British Rail Class 445

British Rail Class 445 and 446
4PEP unit No.4002 in the sidings at Wimbledon depot
In service	1971-1980
Manufacturer	BREL
Order no.	30818 (DMSO, 445, 446) 30819 (MSO, 445)
Built at	BREL York
Family name	1972 design (PEP)
Constructed	1971
Entered service	1973
Number built	2 × 4-car (445) 1 × 2-car (446)
Number scrapped	2 × Class 445 set 1 × Class 446 set
Formation	2/4 cars per trainset: DMSO+MSO+MSO+DMSO (445) DMSO+DMSO (446)
Diagram	861 (DMSO, 445, 446) 862 (MSO, 445)
Design code	PEP
Fleet numbers	4001-4002 (445, set) 2001 (446, set) 64300-64305 (DMSO, 445, 446) 62426-62429 (MSO, 445)
Capacity	280 (445) 136 (446) 68S (DMSO) 72S (MSO)
Operator(s)	British Rail
Specifications
Train length	264 ft 10 in (80.72 m) (445) 132 ft 5 in (40.36 m) (446)
Car length	64 ft 11 1⁄2 in (19.799 m) (DMSO) 65 ft 4 1⁄4 in (19.920 m) (MSO)
Width	9 ft 3 in (2.82 m)
Height	11 ft 6 1⁄2 in (3.518 m)
Doors	Bi-parting sliding
Maximum speed	75 mph (121 km/h)
Weight	31 long tons 6 cwt (31.8 t) (DMSO, 64305) 35 long tons 7 cwt (35.9 t) (DMSO, others) 34 long tons 6 cwt (34.9 t) (MSO)
Traction motors	4 × GEC (per car)
Power output	4 x 100 hp (75 kW) (per car) 1,600 hp (1,200 kW) (445, total) 800 hp (600 kW) (446, total)
Electric system(s)	750 V DC third rail
Current collection method	Contact shoe
Bogies	BT5 (4001) Mk6 (4002, 446) F-type (64305)
Braking system(s)	Air EP/rheostatic (445) Air, rheostatic (446)
Coupling system	Scharfenberg (outer) Bar (inner)
Multiple working	Within type only
Track gauge	1,435 mm (4 ft 8 1⁄2 in) standard gauge

The PEP Stock were prototype electric multiple units used on British Rail's Southern and Scottish Regions during the 1970s and early 1980s. They were forerunners of the British Rail Second Generation electric multiple unit fleet. Three units were built, one two-car unit (2001), and two four-car units (4001/4002). Under TOPS, the driving cars were originally classified as Class 461 with the non-driving motor cars as Class 462. They were later reclassified as Class 445 (4PEP) and Class 446 (2PEP).

Internal layout was for commuter services; low-backed, bus-style 2+2 seating in open saloons, wide gangways with hanging straps, and no lavatory facilities. They were the first electric multiple units designed by British Rail with electric sliding doors, outside the Scottish Region. They were unable to operate with any other stock due to their new coupling system. Externally, 2001 was finished in unpainted aluminium, while 4001/4002 were painted in all-over Rail Blue. In passenger use, they normally operated together as a ten-car formation.

All three units were initially assigned to the South Western Division of the Southern Region, based at Wimbledon Park and Strawberry Hill. Upon arrival, they were used under an extensive testing programme prior to entering full passenger service in June 1973, on services from Waterloo to Chessington South, Hampton Court and Shepperton. In August 1973, all three units were moved to the South Eastern Division, where they worked services from Cannon Street/Charing Cross to Bromley North, Dartford and Sevenoaks. Although capable of being used as a single 10-car formation on the SED, a number of failures saw them returned to the SWD after a month. The Class 446 unit was withdrawn from traffic in August 1974, while the two Class 445s were officially withdrawn from revenue service in May 1977.