British Rail Class 502

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British Rail Class 502
Class 502 at Sandhills in 1979
In service	1939–1980
Manufacturer	LMS[1]
Built at	Derby Works[1]
Replaced	LYR electric units
Constructed	1939-41[1]
Entered service	1939-41
Refurbished	c. 1968 (TC rebuilt as TS or DTC)
Number built	152 cars (total) 59 (DMBS) 50 (TS) 9 (TC) 34 (DTC)[1]
Number preserved	2 cars[2] (1 DMBS, 1 DTC)[3]
Number scrapped	150 cars
Formation	3 or 2 cars: MBSO+TSO+DTCO MBSO+TSO MBSO+TCO[1]
Diagram	EB202 or LMS345 (DMBS) EE207 or LMS393 (DTS) EH202 or LMS379 (TS)[4]
Fleet numbers	28311-28369 (DMBS) 29545-29594 (TS) 29812-29820 (TC) 29866-29899 (DTC)[1]
Capacity	88S (DMBS) 102S (TS) 53F/29S (TC, as built) 82 (TS, rebuilt TC) 47F/29S (DTC, rebuilt TC) 53F/29S (DTC)[1]
Operators	LMS British Rail
Depots	Meols Cop Hall Road Kirkdale
Lines served	Northern Line
Specifications
Car body construction	Steel[4]
Car length	66 ft 6 in (20.27 m)[1]
Width	9 ft 3 in (2.82 m) (over body)[4]
Height	11 ft 7+1⁄16 in (3.53 m) (over vents)[4]
Floor height	3 ft 10+3⁄16 in (1.17 m)[4]
Doors	Bi-parting sliding[1]
Wheelbase	49 ft 0 in (14.94 m) (bogie centres, per car)[4]
Maximum speed	70 mph (110 km/h)[1]
Weight	41 long tons (42 t; 46 short tons) (DMBS) 24 long tons (24 t; 27 short tons) (TS) 24 long tons (24 t; 27 short tons) (TC) 25 long tons (25 t; 28 short tons) (DTC)[1]
Traction motors	4 × EE[1]
Power output	4 × 235 hp (175 kW)/ traction motor total 940 hp (700 kW)[1]
HVAC	Electric[4]
Electric system(s)	630 V DC Third rail[1]
Current collector(s)	Contact shoe
UIC classification	Bo′Bo′+2′2′+2′2′ Bo′Bo′+2′2′
Braking system(s)	Air[1] (EP)[4]
Coupling system	Screw[1]
Multiple working	Within type[1]
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge

The British Rail Class 502 was a type of electric multiple-unit passenger train, originally built by the London, Midland and Scottish Railway at its Derby Works. Introduced in 1940 and withdrawn by 1980, they spent the whole of their working lives on the electrified railway lines north of Liverpool.

The trains were designed to replace older electric trains built by the Lancashire and Yorkshire Railway on the lines from Liverpool Exchange railway station to Southport and Ormskirk. These lines were electrified with a direct current (DC) third rail. The Class 502s entered service between 1940 and 1943. They were DC-only and operated as both three-car and two-car sets, which could be coupled together to form five-car or six-car sets for use on the busier services.