British Rail Class 74

Specifications
Specifications
Configuration:;
• AAR	B-B
• UIC	Bo′Bo′
• Commonwealth	Bo-Bo
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Wheel diameter	4 ft 0 in (1.22 m)
Minimum curve	264 ft 0 in (80.47 m)
Wheelbase	Each bogie:; 10 ft 6 in (3.20 m); Over bogie centres:; 27 ft 0 in (8.23 m);
Length	Over extended buffers:; 50 ft 5+1⁄2 in (15.38 m)
Width	8 ft 11 in (2.72 m)
Height	13 ft 0+1⁄2 in (3.98 m)
Loco weight	77 long tons (78 t; 86 short tons)
Fuel capacity	280 imp gal (1,300 L)
Electric system/s	650–750 V DC third rail
Current pickup(s)	Contact shoe
Prime mover	Paxman 6YJXL
Engine type	6-cylinder, 4-stroke
Generator	English Electric EE843
Traction motors	4 × English Electric EE532A
• Continuous	3000 A total
MU working	★ Blue Star
Train heating	Electric Train Heating (400 A max.)
Train brakes	Air; Vacuum;

Type and origin
Type and origin
Power type	Electro-diesel
Builder	British Railways Doncaster Works
Build date	1958–1960
Rebuilder	Crewe Works
Rebuild date	1967–1968
Number rebuilt	10

British Rail Class 74
British Rail Class 74
	74003 in BR blue with full yellow ends
Power type
Type and origin
Power type	Electro-diesel
Builder	British Railways Doncaster Works
Build date	1958–1960
Rebuilder	Crewe Works
Rebuild date	1967–1968
Number rebuilt	10
Configuration:;
Specifications
Configuration:;
• AAR	B-B
• UIC	Bo′Bo′
• Commonwealth	Bo-Bo
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Wheel diameter	4 ft 0 in (1.22 m)
Minimum curve	264 ft 0 in (80.47 m)
Wheelbase	Each bogie:; 10 ft 6 in (3.20 m); Over bogie centres:; 27 ft 0 in (8.23 m);
Length	Over extended buffers:; 50 ft 5+1⁄2 in (15.38 m)
Width	8 ft 11 in (2.72 m)
Height	13 ft 0+1⁄2 in (3.98 m)
Loco weight	77 long tons (78 t; 86 short tons)
Fuel capacity	280 imp gal (1,300 L)
Electric system/s	650–750 V DC third rail
Current pickup(s)	Contact shoe
Prime mover	Paxman 6YJXL
Engine type	6-cylinder, 4-stroke
Generator	English Electric EE843
Traction motors	4 × English Electric EE532A
• Continuous	3000 A total
MU working	★ Blue Star
Train heating	Electric Train Heating (400 A max.)
Train brakes	Air; Vacuum;
Maximum speed
Performance figures
Maximum speed	90 mph (140 km/h)
Power output	Electric (continuous):; 2,300 hp (1,715 kW); Electric (one-hour):; 2,552 hp (1,903 kW); Engine:; 650 bhp (485 kW);
Tractive effort	On electric supply:; 47,500 lbf (211.3 kN); On diesel engine:; 40,000 lbf (177.9 kN);
Operators
Career
Operators	British Railways
Number in class	10
Numbers	E6101–E6110; later 74001–74010
Axle load class	Route Availability 7
Locale	BR Southern Region
Withdrawn	1976–1977
Disposition	All scrapped

The British Rail Class 74 was an electro-diesel locomotive that operated on the Southern Region of British Railways, rebuilt from redundant Class 71 locomotives in the late 1960s. An electro-diesel locomotive is one that can operate either from an electrical supply, such as overhead catenary or (in this case) an energised third rail, or from an onboard diesel engine. All were withdrawn between June 1976 and December 1977, and scrapped between 1977 and 1981.

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