British Rail Class 84

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 (1.219 m)
Wheelbase	39 ft 6 in (12.04 m)
Length:;
• Over beams	53 ft 6+1⁄2 in (16.32 m)
Width	8 ft 8+1⁄4 in (2.648 m)
Height:;
• Pantograph	13 ft 0+9⁄16 in (3.977 m)
• Body height	12 ft 4+1⁄4 in (3.766 m)
Loco weight	76.60 long tons (77.83 t; 85.79 short tons)
Electric system/s	25 kV AC Catenary
Current pickup(s)	Pantograph
Traction motors	4 × GEC WT501
Gear ratio	25:74
Train heating	Electric Train Heating
Train brakes	Vacuum; Dual from 1972

Type and origin
Type and origin
Power type	Electric
Builder	North British Locomotive Company
Order number	L91
Build date	1960–1961
Total produced	10

British Railways AL4
British Rail Class 84
British Railways AL4; British Rail Class 84
	Preserved locomotive 84001 on display at Crewe Works open day on 11 September 2005
Power type
Type and origin
Power type	Electric
Builder	North British Locomotive Company
Order number	L91
Build date	1960–1961
Total produced	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 (1.219 m)
Wheelbase	39 ft 6 in (12.04 m)
Length:;
• Over beams	53 ft 6+1⁄2 in (16.32 m)
Width	8 ft 8+1⁄4 in (2.648 m)
Height:;
• Pantograph	13 ft 0+9⁄16 in (3.977 m)
• Body height	12 ft 4+1⁄4 in (3.766 m)
Loco weight	76.60 long tons (77.83 t; 85.79 short tons)
Electric system/s	25 kV AC Catenary
Current pickup(s)	Pantograph
Traction motors	4 × GEC WT501
Gear ratio	25:74
Train heating	Electric Train Heating
Train brakes	Vacuum; Dual from 1972
Maximum speed
Performance figures
Maximum speed	100 mph (160 km/h)
Power output:;
• 1 hour	4 × 890 hp (660 kW)
• Continuous	4 × 750 hp (560 kW)
Tractive effort	50,000 lbf (220 kN)
Brakeforce	65.5 long tons-force (653 kN)
Operators
Career
Operators	British Rail
Numbers	E3036–E3045; later 84001–84010
Axle load class	Route availability 6
Retired	1979–1980
Disposition	One preserved, remainder scrapped

The British Rail Class 84 was a 25 kV AC electric locomotive that operated on the West Coast Main Line (WCML) of the London Midland Region.

The ten strong class was one of five prototype classes of electric locomotives built in the early stages of WCML electrification. Built between 1960 and 1961, the type was not a success, as they were beset by technical problems, and after several lengthy periods of storage, and unsuccessful attempts at resolving these problems, British Rail decided to withdraw the entire fleet between 1977 and 1980.

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