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| Sub Class: | 37/0 | 37/3 | 37/4 | 37/5 | 37/6 | 37/7 | 37/9 | 97/3 |
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| TOPS Numbers: | 37001 - 37308 | 37330 - 37383 | 37401 - 37431 | 37501 - 37521 37667 - 37699 |
37601 - 37612 | 37701 - 37719 37796 - 37803 37883 - 37899 |
37901 - 37906 | 97301 - 97304 |
| BR Number: | D6700 - D6999 D6600 - D6608 |
From main fleet | From main fleet | From main fleet | From main fleet | From main fleet | From main fleet | From main fleet |
| Built By: | English Electric, Vulcan Foundry Rober Stephenson & Hawthorn |
- | - | - | - | - | - | - |
| Introduced: | 1960 - 1965 | 1988 - 1995 | 1985 - 1986 | 1986 - 1988 | 1986 - 1988 | 1986 - 1987 | 1986 - 1987 | 2008 |
| Wheel Arrangement: | Co-Co | Co-Co | Co-Co | Co-Co | Co-Co | Co-Co | Co-Co | Co-Co |
| Weight: | 102-108 tonnes | 102-108 tonnes | 107 tonnes | 107 tonnes | 107 tonnes | 120 tonnes | 120 tonnes | 105 tonnes |
| Height (see note 1): | 12ft 9 1/16in or 13ft 3/4in |
12ft 9 1/16in or 13ft 3/4in |
13ft 3/4in | 12ft 9 1/16in or 13ft 3/4in |
12ft 9 1/16in or 13ft 3/4in |
12ft 9 1/16in or 13ft 3/4in |
13ft 3/4in | 12ft 9 1/16in or 13ft 3/4in |
| Length: | 61ft 6in | 61ft 6in | 61ft 6in | 61ft 6in | 61ft 6in | 61ft 6in | 61ft 6in | 61ft 6in |
| Width: | 8ft 11 5/8in | 8ft 11 5/8in | 8ft 11 5/8in | 8ft 11 5/8in | 8ft 11 5/8in | 8ft 11 5/8in | 8ft 11 5/8in | 8ft 11 5/8in |
| Wheelbase: | 50ft 8in | 50ft 8in | 50ft 8in | 50ft 8in | 50ft 8in | 50ft 8in | 50ft 8in | 50ft 8in |
| Bogie wheelbase: | 13ft 6in | 13ft 6in | 13ft 6in | 13ft 6in | 13ft 6in | 13ft 6in | 13ft 6in | 13ft 6in |
| Bogie Pivot Centre: | 37ft 2in | 37ft 2in | 37ft 2in | 37ft 2in | 37ft 2in | 37ft 2in | 37ft 2in | 37ft 2in |
| Wheel Diameter: | 3ft 7in | 3ft 7in | 3ft 7in | 3ft 7in | 3ft 7in | 3ft 7in | 3ft 7in | 3ft 7in |
| Brake Type: | Built with Vacuum only, later dual braked |
Dual | Dual | Dual | Dual | Dual | Dual | Dual |
| Sanding Equipment: | Pneumatic | Pneumatic | Pneumatic | Pneumatic | Pneumatic | Pneumatic | Pneumatic | Pneumatic |
| Heating Type: | Steam (removed) | Not Fitted | Electric - Index 30 | Not Fitted | Not Fitted | Not Fitted | Not Fitted | Not Fitted |
| Train Heat Alternator: | Not Fitted | Not Fitted | Brush BAH 701 | Not Fitted | Not Fitted | Not Fitted | Not Fitted | Not Fitted |
| Route Availability: | 5 | 5 | 5 | 5 | 5 | 7 | 7 | 5 |
| Multiple working: | Blue Star | Blue Star | Blue Star | Blue Star | Blue Star & DRS | Blue Star | Blue Star | Blue Star |
| Brake Force: | 50 tonnes | 50 tonnes | 50 tonnes | 50 tonnes | 50 tonnes | 50 tonnes | 50 tonnes | 50 tonnes |
| Engine Type: | EE 12CSVT | EE 12CSVT | EE 12CSVT | EE 12CSVT | EE 12CSVT | EE 12CSVT | Mirrlees MB 275T (37901-4) Ruston RX 270T (37905/6) |
EE 12CSVT |
| Engine Horsepower: | 1,750hp | 1,750hp | 1,750hp | 1,750hp | 1,750hp | 1,750hp | 1,800hp | 1,750hp |
| Power at Rail: | 1,250hp | 1,250hp | 1,250hp | 1,250hp | 1,250hp | 1,250hp | 1,300hp | 1,250hp |
| Tractive Effort: | 55,500lb | 56,180lb | 57,440lb | 55,590lb | 55,500lb | 61,910lb | 62,000lb (37901-4) 62,680lb (37905/6) |
55,500lb |
| Cylinder Bore: | 10in | 10in | 10in | 10in | 10in | 10in | 10¼in | 10in |
| Cylinder Stroke: | 12in | 12in | 12in | 12in | 12in | 12in | 12¼in | 12in |
| Main Generator Type: | EE 822/10G, EE822-13G or EE822-16J | EE 822/10G, EE822-13G or EE822-16J | N/A | N/A | N/A | N/A | N/A | EE 822/10G, EE822-13G or EE822-16J |
| Main Alternator Type: | N/A | N/A | Brush BA1005A | Brush BA1005A | Brush BA1005A | Brush BA1005A GEC G564AZ (37796-37803) |
Brush BA1005A GEC G564AZ (37905/6) |
N/A |
| Auxiliary Generator Type: | EE911/5C | EE911/5C | N/A | N/A | N/A | N/A | N/A | EE911/5C |
| Auxiliary Alternator Type: | N/A | N/A | Brush BAA606A | Brush BAA606A | Brush BAA606A | Brush BAA606A G658A, 659AZ or 658BY (37796-37803) |
Brush BA606A (37901-4) GEC 564 (37905/6) |
N/A |
| Number of Traction Motors: | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Gear Ratio: | 53:18 | 59:16 | 59:16 | 59:16 | 59:16 | 59:16 | 59:16 | 53:18 |
| Fuel Tank Capacity (See note 2): | 890gal or 1690gal | 1690gal | 1690gal | 1690gal | 1690gal | 1690gal | 1690gal | 1690gal |
| Cooling Water Capacity: | 160gal | 160gal | 160gal | 160gal | 160gal | 160gal | 160gal | 160gal |
| Boiler Water Capacity (See note 2): | 800gal | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Boiler Fuel Capacity | From Main Supply | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Lubrication Oil Capacity: | 120gal | 120gal | 120gal | 120gal | 120gal | 120gal | 120gal | 120gal |
Notes:
1: Locomotives fitted with body mounted horns are 12ft 9 1/16in in height, those with roof mounted horns are 13ft 3/4in in height.
2: Following the removal of the steam heating system, the steam boiler water tank was converted to an additional fuel tank, to provided an extra 800 gallons capacity.