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Record: 71951 (21/04/2026)
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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

Manufacturer	Total
North British Locomotive Company, Glasgow	58

Number Range (as built)

D6100-D6157

Number Built

Reports

Title

NBL Type 2 (Class 21/29) re-engine schedule: MAN to Paxman

Orders

Builder	Order #	Date	Size
North British Locomotive Company, Glasgow	L79	1955	10
North British Locomotive Company, Glasgow	L94	01/05/1957	48

**Illustration**

Copyright: Unknown - please contact me if you know the copyright holder (17/04/1965)

**Miscellaneous**
Year Introduced	1958
Maximum Speed	75mph
Sanding Equipment	Pneumatic
Route Availability	5
Brake Type (loco - as built)	Vacuum

**Dimensions**
Weight	73t 0cwt
Wheel Diameter	3' 7"
Length	51' 6"
Height	12' 6⁷⁄₈"
Width	8' 8"
Wheelbase	37'
Bogie Wheelbase	8' 6"
Bogie Pivot Centres	28' 6"
Minimum Curve	4.5

**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

Complete BR Locomotive Database 1948-1997

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NB 21 Bo-Bo