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


Class Types
NBR Class N

General
Designer Holmes
Introduced 1886
Pre-Grouping North British Railway
Big Four London and North Eastern Railway
Wheels 4-4-0
Number Built as D25 12
First in Service 04/1886
Last in Service 07/1933
Manufacturers
ManufacturerTotal
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' 734"
Descriptive Wheelbase 6' 6" + 6' 7" + 9' 3" + 9' 3¾" + 6' 0" + 6' 0" = 43' 7¾'"

Dimensions
Length (over buffers) 53' 014"
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' 312"
Boiler Barrel Length 10' 312"
Boiler Pressure 150lbs
Firebox Length 6' 6"
Firebox Grate Area 20.3ft2
Firebox Heating Surface 116.5ft2
Tube Number 203
Tube Diameter 134"
Tube Area 989.68ft2
Total Evaporative Area 1106.18ft2
Total Heating Area 1106.18ft2