CLASS 21-29

Class:

21

29

1957 BR number range:

D6100-D6157

Note: 1

Former class codes:

As built - D11/2, later 11/4
De-rated - D10/1, later 10/4

13/4
13/4

Built by:

NBL Ltd

Rebuilt - BR Glasgow Works

Introduced:

1958-60

1965

Wheel arrangement:

Bo-Bo

Bo-Bo

Weight (operational):

73 tonnes

73 tonnes

Height:

12ft 6 7/8in

12ft 6 7/8in

Width:

8ft 8in

8ft 8in

Length:

51ft 6in

51ft 6in

Min curve negotiable:

4 1/2 chains

4 1/2 chains

Maximum speed:

75mph

80mph

Wheelbase:

37ft

37ft

Bogie wheelbase:

8ft 6in

8ft 6in

Bogie pivot centres:

28ft 6in

28ft 6in

Wheel diameter:

3ft 7in

3ft 7in

Brake type:

Vacuum

Vacuum

Sanding equipment:

Pneumatic

Pneumatic

Route availability:

5

5

Heating type:

Steam - Spanner Mk 1

Steam Spanner Mk 1

Multiple coupling restriction:

Red Cicle
Blue Star later fitted on Nos. D6104/22/35/38-57

Red Cicle

Brake force:

42 tonnes

42 tonnes

Engine type:

NBL/MAN L12V18/21

Paxman 12YJXL

Engine horsepower:

Original: 1,100hp
Modified: 1,000hp

1,350hp

Power at rail:

Original: 890hp
Modified: 816hp

925hp

Tractive effort:

45,0001b

47,0001b

Cylinder bore:

7in

7in

Cylinder stroke:

8 1/4in

7 3/4in

Main generator type:

EE WT880

EE WT880

Aux generator type:

EE WT761

EE WT761

Number of traction motors:

4

4

Traction motor type:

EE WT440

EE WT440

Gear ratio:

Fuel tank capacity:

36Ogal

375gal

Cooling water capacity:

146gal

146gal

Lub oil capacity :

?? gal

?? gal

Boiler water capacity:

600gal

600gal

Boiler fuel capacity:

10Ogal

From main supply

 

Note 1: Locos rebuilt from Class 21 to 29: - D6100-03/06-08/12-14/16/19/21/23/24/29/30/33/34/37

 

Last updated 11/12/05