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NB 21 Bo-Bo


Class Types
1955 Class D10/1
1955 Class D11/2
Pre-Tops Class 10/4
Pre-Tops Class 11/4
TOPS Class 21

General
Year Introduced 1958
Wheel Arrangement Bo-Bo
Manufacturers
ManufacturerTotal
North British Locomotive Company, Glasgow 58
Number Range (as built) D6100-D6157
Number Built 58
Reports
Title
NBL Type 2 (Class 21/29) re-engine schedule: MAN to Paxman

Illustration
Copyright: Gerald Robinson (17/04/1965)
Miscellaneous
Year Introduced 1958
Maximum Speed 75mph
Sanding Equipment Pneumatic
Route Availability 5
Brake Type (loco - as built) Vacuum

Dimensions
Wheel Diameter 3' 7"
Length 51' 6"
Height 12' 678"
Width 8' 8"
Wheelbase 37'
Bogie Wheelbase 8' 6"
Bogie Pivot Centres 28' 6"

Power
Power Unit MAN L12V18/21S
Tractive Effort 45,000lbs
Horse Power 1100hp
Power at Rail 816hp

Transmission
Transmission Type Electric
Traction Motor Number 4

Heating
Heating Type Steam
Boiler Water Capacity 600gal

Fuel, Lubricants, Water
Fuel Capacity 360gal
Coolant Capacity 146gal