British Rail Class 25

Class 25 locomotive stands on Springs Branch Traction Maintenance Depot at Wigan

Type and origin
Power type	Diesel-electric
Builder	British Railways’ Crewe Works, Darlington Works and Derby Works; Beyer, Peacock & Co.
Build date	1961–1967
Total produced	327

Specifications
Configuration:
• Whyte	Bo-Bo
• UIC	Bo'Bo'
Gauge	4 ft 8 ¹⁄₂ in (1,435 mm) standard gauge
Wheel diameter	3 ft 9 in (1.143 m)
Minimum curve	4.5 chains (91 m)
Wheelbase	36 ft 6 in (11.125 m)
Length	50 ft 6 in (15.392 m)
Width	9 ft 1 in (2.769 m)
Height	12 ft 8 in (3.861 m)
Loco weight	71 long tons (72.1 t) to 76 long tons (77.2 t)
Fuel capacity	500 imp gal (2,300 L; 600 US gal)
Prime mover	Sulzer 6LDA28-B
Transmission	DC generator, DC traction motors
MU working	★ Blue Star
Train heating	Steam generator
Train brakes	Vacuum

Performance figures
Top speed	90 mph (145 km/h)
Power output	Engine: 1,250 hp (932 kW)
Tractive effort	Maximum: 39,000 lbf (173,000 N) to 45,000 lbf (200,000 N)
Brakeforce	38 long tons-force (380 kN)

Career
Railroad(s)	British Railways
Number	D5151–D5299, D7500–D7677; later 25001–25327
Nicknames	Rats
Axle load class	Route availability 4

The British Rail Class 25 diesel locomotives were originally known as British Railways Type 2. They were nicknamed Rats. 327 locomotives of this type were built between 1961 and 1967.

v t e British Rail non-steam locomotives
Diesel shunters:	01 · 01/5 · 02 · 03 · 04 · 05 · 06 · 07 · 08 · 09 · 10 · 11 · 12 · 13 · 14
Diesel shunters (pre-TOPS):	11001 · 11104 · 15107 · 13000 · D1/1 · D1/2 · D1/3 · D1/4 · D2/1 · D2/2 · D2/3 · D2/4 · D2/5 · D2/6 · D2/7 · D2/8 · D2/9 · D2/10 · D2/11 · D2/12 · D3/1 · D3/2 · D3/3 · D3/4 · D3/5 · D3/6 · D3/7 · D3/8 · D3/9 · D3/10 · D3/11 · D3/12 · D3/13 · D3/14
Main-line diesels:	15 · 16 · 17 · 18 · 20 · 21 (I) · 21 (II) · 22 (I) · 23 · 24 · 25 · 26 · 27 · 28 · 29 · 30 · 31 · 33 · 34 · 35 · 37 · 38 · 40 · 41 (I) · 41 (II) · 42 · 43 (I) · 43 (II) · 44 · 45 · 46 · 47 · 48 (I) · 48 (II) · 50 · 51 · 52 · 53 · 55 · 56 · 57 · 58 · 59 · 60 · 61 · 62 · 65 · 66 · 67
Main-line diesels (pre-TOPS):	10000–10001 · 10100 · 10201–10203 · 10800 · D8/1 · D8/2 · D10/1 · D10/2 · D10/3 · D11/1 · D11/2 · D11/3 · D11/4 · D11/5 · D12/1 · D12/2 · D12/3 · D13/1 · D14/1 · D14/2 · D15/1 · D15/2 · D16/1 · D16/2 · D17/1 · D17/2 · D20/1 · D20/2 · D22/1 · D22/2 · D23/1 · D25/1 · D27/1 · D33/1 · KA · KB
Electrics:	22 (II) · 70 · 71 · 72 · 73 · 74 · 75 · 76 · 77 · 80 · 81 · 82 · 83 · 84 · 85 · 86 · 87 · 88 · 89 · 90 · 91 · 92 · 93
Electrics (pre-TOPS):	AL1 · AL2 · AL3 · AL4 · AL5 · AL6 · EB1 · EE1 · EF1 · EM1 · EM2 · ES1 · HA · HB · JA · JB
Departmental:	97 · 97/6 · Eastern · Southern · Other Series
Prototypes:	15097–15099 · 18000 · 18100 · D0226/D0227 · D0260 · D0280 · D2999 · DHP1 · DP1 · DP2 · GT3 · HS4000 · Janus/Taurus · Powerhaul
Lists: Diesel locomotives · Electric locomotives · Miscellaneous locomotives · Diesel multiple units · Electric multiple units · Departmental multiple units

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