CLASS 20

Sub class:

20/0

20/3 (BR)

20/3 (BNFL/DRS)

20/9

TOPS number range:

20001-20228

20301-20308

20301-20315

20901-20906

1957 BR number range:

D8000-D8199,
D8300-D8327

See Note 1

See Note 2

See Note 3

Former class codes:

D10/3, then 10/3

-

-

-

Built by:

English Electric, Vulcan Foundry or Robert Stephenson & Hawthorns

Converted: BR Toton

Converted: Brush Traction or RFS Doncaster

Converted: Hunslet Barclay, Kilmarnock

Years introduced:

1957-1968

1986 (as 20/3)

1995-1998 (as 20/3)

1989 (as 20/9)

Wheel arrangement:

Bo-Bo

Bo-Bo

Bo-Bo

Bo-Bo

Weight

73 tonnes

73 tonnes

73 tonnes

73 tonnes

Height:

12ft 7 5/8in (3.84m)

12ft 7 5/8in (3.84m)

12ft 7 5/8in (3.84m)

12ft 7 5/8in (3.84m)

Length:

46ft 9 1/4in (14.26m)

46ft 9 1/4in (14.26m)

46ft 9 1/4in (14.26m)

46ft 9 1/4in (14.26m)

Width:

8ft 9in (2.66m)

8ft 9in (2.66m)

8ft 9in (2.66m)

8ft 9in (2.66m)

Wheelbase:

32ft 6in (9.90m)

32ft 6in (9.90m)

32ft 6in (9.90m)

32ft 6in (9.90m)

Bogie wheelbase:

8ft 6in (2.59m)

8ft 6in (2.59m)

8ft 6in (2.59m)

8ft 6in (2.59m)

Bogie pivot centres:

24ft 0in (7.31m)

24ft 0in (7.31m)

24ft 0in (7.31m)

24ft 0in (7.31m)

Wheel diameter:

3ft 7in (1.09m)

3ft 7in (1.09m)

3ft 7in (1.09m)

3ft 7in (1.09m)

Min curve negotiable:

3.5 chains (70.40m)

3.5 chains (70.40m)

3.5 chains (70.40m)

3.5 chains (70.40m)

Engine type:

English Electric 8SVT Mk2

English Electric 8SVT Mk2

English Electric 8SVT Mk2

English Electric 8SVT Mk2

Engine output:

1,000hp (745kW)

1,000hp (745kW)

1,000hp (745kW)

1,000hp (745kW)

Power at rail:

770hp (574kW)

770hp (574kW)

770hp (574kW)

770hp (574kW)

Tractive effort:

42,000lb (187kN)

42,000lb (187kN)

42,000lb (187kN)

42,000lb (187kN)

Cylinder bore:

10in (0.25m)

10in (0.25m)

10in (0.25m)

10in (0.25m)

Cylinder stroke:

12in (0.35m)

12in (0.35m)

12in (0.35m)

12in (0.35m)

Maximum speed:

20/3 75mph (121km/h)

20/3 75mph (121km/h)

20/3 75mph (121km/h)

20/9 60mph (97km/h)

Brake type:

Vacuum, later dual

Dual

Air

Air

Brake force:

35 tonnes

35 tonnes

35 tonnes

35 tonnes

Route availability:

5

5

5

5

Heating type:

Not fitted (through piped)

Not fitted

Not fitted

Not fitted

Multiple coupling type:

Blue star

Blue star

DRS system (Note 4)

Blue star

Main generator type:

EE819-3C

EE819-3C

EE819-3C

EE819-3C

Aux generator type:

EE911-2B

EE911-2B

EE911-2B

EE911-2B

ETS generator type:

Not fitted

Not fitted

Not fitted

Not fitted

Traction motor type:

EE526-8D

EE526-8D

EE526-8D

EE526-8D

No of traction motors:

4

4

4

4

Gear ratio:

63:17

63:17

63:17

63:17

Fuel tank capacity:

380gal (1,727lit)

380gal (1,727lit)

640gal (2,909lit)

380gal (1,727lit)

Cooling water capacity:

130gal (591lit)

130gal (591lit)

130gal (591lit)

130gal (591lit)

Lub oil capacity:

100gal (455lit)

100gal (455lit)

100gal (455lit)

100gal (455lit)

Sanding equipment:

Pneumatic

Pneumatic

Pneumatic

Pneumatic

Special fittings:

Snowplough brackets

Snowplough brackets

Snowplough brackets, OTMR, TPWS

Sub class variations:

Standard as built locos

Small fleet of standard Class 20/0s modified for Peak Forest aggreate workings

DRS-owned/operated locos fitted with modified cab equipment and fully refurbished

Modified from Class 20/0 after withdrawal by BR sold to Hunslet-Barclay of Kilmarnock for contract freight use. Few technical modifications carried out from standard locos. Later sold to DRS amd recently some to HNRC