British Rail Class 507

British Rail Class 507
Merseyrail Class 507 No. 507019 at Liverpool Central
The interior of a Merseyrail refurbished Class 507
In service	1978 - Current
Manufacturer	BREL
Order no.	30906 (BDMSO) 30907 (TSO) 30908 (DMSO)
Built at	York Works
Family name	BREL 1972 "PEP"
Replaced	British Rail Class 502 British Rail Class 503
Constructed	1978–1980
Entered service	1 November 1978
Refurbishment	32 Merseyrail sets 2002 - 2005: Alstom Eastleigh Works
Number built	33 trainsets
Number in service	32
Number scrapped	1 trainsets
Formation	3 cars per trainset BDMSO+TSO+DMSO
Diagram	EI202 (BDMSO) EH205 (TSO) EA201 (DMSO)
Fleet numbers	507001-507033 (sets) 64367-64399 (DMSO) 71342-71374 (TSO) 64405-64437 (BDMSO)
Capacity	234 seats (set, as-built) 222 seats (modified) 192 seats (refurbished)
Operator(s)	Merseyrail
Depot(s)	Kirkdale TMD Birkenhead North TMD Hall Road TMD
Line(s) served	Northern Line Wirral Line
Specifications
Car body construction	Steel underframe and body frame, aluminium body and roof
Car length	19.8 m (65 ft 0 in) (over body)
Width	2.82 m (9 ft 3 in) (over body)
Height	3.582 m (11 ft 9.0 in)
Floor height	1.146 m (45.1 in)
Doors	4 × Twin electro-pneumatic sliding doors per car 2 × electro-pneumatic sliding doors per driving car 2 × gangway end doors per car
Articulated sections	3
Wheelbase	14.170 m (46.49 ft) (bogie centres, per car)
Maximum speed	75 mph (121 km/h)
Weight	104.5 tonnes (102.8 long tons) (total) 37.06 t (36.47 long tons; 40.85 short tons) (BDMSO) 25.60 t (25.20 long tons; 28.22 short tons) (TSO) 35.62 t (35.06 long tons; 39.26 short tons) (DMSO)
Traction motors	4 × GEC G310AZ of 82.125 kW (110.131 hp) (per motor car)
Power output	Total: 656 kW (880 hp)
Train heating	Electric-ducted warm air
Electric system(s)	600/750 V DC third rail
Current collection method	Contact shoe
UIC classification	Bo'Bo'+2'2'+Bo'Bo'
Bogies	BX1
Braking system(s)	Electro-pneumatic Disc and rheostatic
Safety system(s)	Emergency end doors PA AWS
Coupling system	Automatic tightlock (outer) Bar (inner)
Multiple working	Within class and Class 508
Headlight type	Fluorescent and tungsten
Track gauge	1,435 mm (4 ft 8 1⁄2 in) standard gauge

The Class 507 is a type of electric multiple unit (EMU) train built by British Rail Engineering Limited at York Works in two batches from 1978 to 1980. They were the second variety of British Rail's standard 1972 design for suburban EMUs derived from PEP stock, which eventually encompassed 755 vehicles and five Classes (Class 313/314/315/507/508). The 507s were the first variant to be 750 V DC third rail only. They have worked on the Merseyrail network from new, and continue to do so, having been refurbished by Alstom's Eastleigh Works.

With the Class 502 units life-expired, unable to cope with the demands of the new "Link" tunnel and approaching 40 years old, by 1977 a replacement was sought. Owing to the success of the Class 313 fleet on suburban services from King's Cross, four sets were temporarily transferred to Merseyside and based at Hall Road TMD. Sets 313013/063 were used for clearance trials on the Southport, Ormskirk and Kirkby-Garston lines. The results showed that a similar type of stock would be suitable for the Merseyrail Northern Line.