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NBR/LNER Holmes "D25" Class 4-4-0

**Class Types**
NBR Class	N

General

Designer

Matthew Holmes

Introduced

1886

Pre-Grouping Company

North British Railway

Grouping Company

London and North Eastern Railway

Wheel Arrangement

4-4-0

Number Built as D25

First in Service

04/1886

Last in Service

07/1933

Manufacturers

Manufacturer	Total
Cowlairs Works	12

**Power**
Variant Introduced	1886
Tractive Effort	12,786lbs
Inside Cylinders	18" x 26" (2 off)
Inside Valves	Slide
Inside Motion	Stephenson

**Wheels**
Pony	3' 6"
Drivers	7'
Locomotive Wheelbase	22' 4"
Tender Wheelbase	12'
Total Wheelbase	43' 7³⁄₄"
Descriptive Wheelbase	6' 6" + 6' 7" + 9' 3" + 9' 3¾" + 6' 0" + 6' 0" = 43' 7¾'"

**Dimensions**
Length (over buffers)	53' 0¹⁄₄"
Weight (in running order)	78t 4cwt
Weight (loco only)	46t 4cwt
Adhesive Weight	31t 17cwt
Maximum Axle Load	17t 2cwt
Water Capacity	2,500gal
Coal Capacity	4t 0cwt

**Boiler & Firebox**
Boiler Diagram	82
Boiler Max Diameter	4' 4"
Boiler Min Diameter - tapered boiler	10' 3¹⁄₂"
Boiler Barrel Length	10' 3¹⁄₂"
Boiler Pressure	150lbs
Firebox Length	6' 6"
Firebox Grate Area	20.3ft²
Firebox Heating Surface	116.5ft²
Tube Number	203
Tube Diameter	1³⁄₄"
Tube Area	989.68ft²
Total Evaporative Area	1106.18ft²
Total Heating Area	1106.18ft²

Complete BR Locomotive Database 1948-1997

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NBR/LNER Holmes "D25" Class 4-4-0