Class 27 Diesel Loco
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Built by: Birmingham RCW 
Introduced: 1961-1962 
Wheel arrangement: Bo-Bo  
Weight: 74-77 tonnes  
Height: 12ft 8in
Width: 8ft 10in 
Length: 50ft 9in  
Min curve negotiable: 5 chains
Maximum speed: 90mph 
Wheelbase: 39ft 
Bogie wheelbase: 10ft 
Bogie pivot centres: 29ft 
Wheel diameter: 3ft 7in 
Brake type: Originally - Vacuum, modified to Dual 
Sanding equipment: Pneumatic 
Route availability: 5
Heating type: Steam - Stones 
Multiple coupling restriction: Blue Star 
Brake force: 35 tonnes 
Engine type: Sulzer 6LDA28B 
Engine horsepower: 1,250hp
Power at rail: 933hp 
Tractive effort: 40,000 lb
Cylinder bore: 11 in 
Cylinder stroke: 14 in 
Main generator type: GEC WT981  
Aux generator type: GEC WT782 
Number of traction motors: 4
Traction motor type: GEC WT459 
Gear ratio: 60:17  
Fuel tank capacity: 970gal 
Cooling water capacity: 190gal 
Lub oil capacity: 100gal 
Boiler water capacity: 300gal 
 
Thanks to The Railway Centre for providing this information.