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NBR/LNER Holmes "D26" Class 4-4-0


Class Types
NBR Class K

General
Designer Holmes
Introduced 1903
Pre-Grouping North British Railway
Big Four London and North Eastern Railway
Wheels 4-4-0
Number Built as D26 12
Number Scrapped 12
Number Preserved 0
First in Service 05/1903
Last in Service 07/1926
Manufacturers
ManufacturerTotal
Cowlairs Works 12
Orders
BuilderOrder #DateSize
Cowlairs Works n/a 17/03/1902 12
Historical Data All engines were fitted with steam heating apparatus - 325-8 were fitted with the Midland type for use on trains over the Waverley route. 318/20/2/4/7 were fitted with tablet catchers for use on the Dundee-Aberdeen main line.

Power
Variant Introduced 1903
Tractive Effort 19,434lbs
Inside Cylinders 19" x 26" (2 off)
Inside Valves 8.75"Piston
Inside Motion Stephenson

Wheels
Pony 3' 6"
Drivers 6' 6"
Locomotive Wheelbase 23' 7"
Tender Wheelbase 13' 2"
Total Wheelbase 46' 812"
Descriptive Wheelbase 6' 6" + 7' 7" + 9' 6" + 9' 7½" + 6' 9" + 6' 9" = 46' 8½"

Dimensions
Length (over buffers) 56' 3"
Weight (in running order) 92t 0cwt
Weight (loco only) 52t 0cwt
Adhesive Weight 35t 0cwt
Maximum Axle Load 18t 6cwt

Boiler & Firebox
Boiler Max Diameter 4' 818"
Boiler Barrel Length 11' 4"
Boiler Pressure 190lbs
Boiler Pitch 7' 9"
Firebox Length 6' 812"
Firebox Grate Area 22.5ft2
Firebox Heating Surface 133ft2
Tube Number 254
Tube Diameter 178"
Tube Area 1444ft2
Total Evaporative Area 1577ft2
Total Heating Area 1577ft2