CLASS 27

Sub class	27/0	27/1	27/2
TOPS number range:	27001-27066	27101-27124	27201-27212
1957 BR number range:	D5347-D5415	From 27/0 series	From 27/1 series
Former class codes:	D12/3, later 12/6	-	-
Built by:	Birmingham RCW Smethwick	Rebuilt by Glasgow Works	Rebuilt by Derby Works
Introduced:	1961-1962	1970	1974-1975
Wheel arrangement:	Bo-Bo	Bo-Bo	Bo-Bo
Weight (operational):	74-77 tonnes	74-77 tonnes	74-77 tonnes
Height:	12ft 8in	12ft 8in	12ft 8in
Width:	8ft 10in	8ft 10in	8ft 10in
Length:	50ft 9in	50ft 9in	50ft 9in
Min curve negotiable:	5 chains	5 chains	5 chains
Maximum speed:	90mph	90mph	90mph
Wheelbase:	39ft	39ft	39ft
Bogie wheelbase:	10ft	10ft	10ft
Bogie pivot centres:	29ft	29ft	29ft
Wheel diameter:	3ft 7in	3ft 7in	3ft 7in
Brake type:	Originally -Vacuum, modified to Dual	Dual	Dual
Sanding equipment:	Pneumatic	Pneumatic	Pneumatic
Route availability:	5	5	5
Heating type:	Steam - Stones Vapor OK 4616	Steam - Stones Vapor OK 4616	Electric - Deutz 130kW engine/generator set
Multiple coupling restriction:	Blue Star	Blue Star	Blue Star
Brake force:	35 tonnes	35 tonnes	35 tonnes
Engine type:	Sulzer 6LDA28B	Sulzer 6LDA28B	Sulzer 6LDA28B
Engine horsepower:	1,250hp	1,250hp	1,250hp
Power at rail:	933hp	933hp	933hp
Tractive effort:	40,000 lb	40,000 lb	40,000 lb
Cylinder bore:	11 in	11 in	11 in
Cylinder stroke:	14 in	14 in	14 in
Main generator type:	GEC WT981	GEC WT981	GEC WT981
Aux generator type:	GEC WT782	GEC WT782	GEC WT782
Number of traction motors:	4	4	4
Traction motor type:	GEC WT459	GEC WT459	GEC WT459
Gear ratio:	17:60	17:60	17:60
Fuel tank capacity:	450gal	450gal	970gal
Cooling water capacity:	19Ogal	19Ogal	19Ogal
Lub oil capacity:	10Ogal	10Ogal	10Ogal
Boiler water capacity:	50Ogal	50Ogal	-