British Rail Class D3/11 was a locomotive commissioned by the Great Western Railway, but delivered to its successor British Rail in England. It was a diesel powered locomotive in the pre-TOPS period.

Statistics

• Great Western number range: 502-507 (not carried)
• BR 1948 number range: 15101-15106
• Former class codes: D3/11, later 3/11
• Built by: BR Swindon
• Years introduced: 1948
• Wheel arrangement: 0-6-0
• Weight: 46 long tons 9 cwt
• Height: 12 ft 5⅝ in
• Length: 29 ft 1½ in
• Width: 9 ft 0 in (2.74 m)
• Wheelbase: 11 ft 6 in (3.51 m)
• Wheel diameter: 4 ft 0½ in
• Min curve negotiable: 3½ chains
• Engine type: English Electric 6KT
• Engine output: 350 hp (260 kW)
• Power at rail: 194 hp (145 kW)
• Tractive effort: 33,500 lbf (149,000 N)
• Cylinder bore: 10 in
• Cylinder stroke: 12 in
• Maximum speed: 20 mph (32 km/h)
• Brake type: Air on loco, no train brakes
• Route availability: 5
• Heating type: Not fitted
• Multiple coupling type: Not fitted
• Main generator type: EE801B
• Aux generator type: EE??
• Traction motor type: EE506B
• No of traction motors: 2
• Gear ratio: 21.7:1
• Fuel tank capacity: 659 gal
• Cooling water capacity: 140 gal
• Lubricating oil capacity: 65 gal
• Sanding equipment: Pneumatic