CLASS 23

1957 BR number range:

D5900-D5909

Former class codes:

D11 /1, later 11/3

Built by:

EE Vulcan Foundry

Introduced:

1959

Wheel arrangement:

Bo-Bo

Weight (operational):

74 tonnes

Height:

12ft 8in

Width:

8ft 10 3/4in

Length:

52ft 6in

Min curve negotiable:

4 1/2 chains

Maximum speed:

75mph

Wheelbase:

40ft 6in

Bogie wheelbase:

8ft 6in

Bogie pivot centres:

32ft

Wheel diameter:

3ft 7in

Brake type:

Vacuum

Sanding equipment:

Pneumatic

Route availability:

5

Heating type:

Steam - Stone OK 4616

Multiple coupling restriction:

Blue Star

Brake force:

36 tonnes

Engine type:

Napier 'Deltic' T9 - 29

Engine horsepower:

1,100hp

Power at rail:

768hp

Tractive effort:

47,000lb

Cylinder bore:

5 1/8in

Cylinder stroke:

3 1/2in

Main generator type:

EE 835D

Aux generator type:

EE 912

Number of traction motors:

4

Traction motor type:

EE 533A

Gear ratio:

62:17

Fuel tank capacity:

450gal

Cooling water capacity:

?? gal

Lub oil capacity :

?? gal

Boiler fuel capacity:

100gal

Boiler water capacity:

500gal