|
Sub class: |
25/0 |
25/1 |
25/2 |
25/3 |
25/9 |
|
TOPS number range: |
25001 25025 |
25026 25082 |
25083 25247 |
25248 25327 |
25901 25912 |
|
1957 BR number range: |
D5151-D5175 |
D5176-D5232 |
D5233-D7597 |
D7598-D7677 |
Modified from 25/3 |
|
Former class codes: |
D12/1, later 12/1 |
D12/1, later 12/1 |
D12/1, later 12/1 |
D12/1, later 12/1 |
- |
|
Built by: |
BR Darlington |
BR Darlington, |
BR Darlington, |
BR Derby, |
Rebuilt by BR Crewe |
|
Introduced: |
1961-62 |
1963 |
1963-66 |
1965-67 |
Modified 1986 |
|
Wheel arrangement: |
Bo-Bo |
Bo-Bo |
Bo-Bo |
Bo-Bo |
Bo-Bo |
|
Weight (operational): |
72 tonnes |
72 tonnes |
76 tonnes |
76 tonnes |
76 tonnes |
|
Height: |
12ft 8in |
12ft 8in |
12ft 8in |
12ft 8in |
12ft 8in |
|
Width: |
9ft 1 in |
9ft 1 in |
9ft 1 in |
9ft 1 in |
9ft 1 in |
|
Length: |
50ft 6in |
50ft 6in |
50ft 6in |
50ft 6in |
50ft 6in |
|
Min curve negotiable: |
4 Chains |
4 Chains |
4 Chains |
4 Chains |
4 Chains |
|
Maximum speed: |
90 mph |
90 mph |
90 mph |
90 mph |
60 mph |
|
Wheelbase: |
36ft 6in |
36ft 6in |
36ft 6in |
36ft 6in |
36ft 6in |
|
Bogie wheelbase: |
8ft 6in |
8ft 6in |
8ft 6in |
8ft 6in |
8ft 6in |
|
Bogie pivot centres: |
28ft |
28ft |
28ft |
28ft |
28ft |
|
Wheel diameter: |
3ft 9in |
3ft 9in |
3ft 9in |
3ft 9in |
3ft 9in |
|
Brake type: |
Vacuum |
Vacuum, later Dual |
Vacuum, later Dual |
Vacuum, later Dual |
Dual |
|
Sanding equipment: |
Pneumatic |
Pneumatic |
Pneumatic |
Pneumatic |
Pneumatic |
|
Heating type: |
Steam - Stone 4610, mostly isolated in later years |
Steam - Stone 4610, mostly isolated in later years |
Steam - Stone 4610 fitted to D7568-D7597, mostly isolated in later years |
Not fitted |
Not fitted |
|
Route availability: |
5 |
5 |
5 |
5 |
5 |
|
Coupling restriction: |
Blue Star |
Blue Star |
Blue Star |
Blue Star |
Blue Star |
|
Brake force: |
38 tonnes |
38 tonnes |
38 tonnes |
38 tonnes |
38 tonnes |
|
Engine type: |
Sulzer 6LDA 28B |
Sulzer 6LDA 28B |
Sulzer 6LDA 28B |
Sulzer 6LDA 28B |
Sulzer 6LDA 28B |
|
Engine horsepower: |
1,250hp |
1,250hp |
1,250hp |
1,250hp |
1,250hp |
|
Power at rail: |
949hp |
949hp |
949hp |
949hp |
949hp |
|
Tractive effort: |
45,0001b |
45,0001b |
45,0001b |
45,0001b |
45,0001b |
|
Cylinder bore: |
11 in |
11 in |
11 in |
11 in |
11 in |
|
Cylinder stroke: |
14 in |
14 in |
14 in |
14 in |
14 in |
|
Main generator type: |
AEI RTB 15656 |
AEI RTB 15656 |
AEI RTB 15656 |
AEI RTB 15656 |
AEI RTB 15656 |
|
Aux generator type: |
AEI RTB 7440 |
AEI RTB 7440 |
AEI RTB 7440 |
AEI RTB 7440 |
AEI RTB 7440 |
|
Number of traction motors: |
4 |
4 |
4 |
4 |
4 |
|
Traction motor type: |
AEI 137BX |
AEI 253AY |
AEI 253AY |
AEI 253AY |
AEI 253AY |
|
Gear ratio: |
67:18 |
67:18 |
67:18 |
67:18 |
67:18 |
|
Fuel tank capacity: |
500gal |
500gal |
500gal |
500gal |
500gal |
|
Cooling water capacity: |
187gal |
187gal |
187gal |
187gal |
187gal |
|
Boiler water capacity: |
580gal |
580gal |
580gal |
Not fitted |
Not fitted |
|
Lub oil capacity: |
10Ogal |
10Ogal |
10Ogal |
10Ogal |
10Ogal |
|
Boiler fuel capacity: |
From main supply |
From main supply |
From main supply |
Not fitted |
Not fitted |
Last updated 11/12/05