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Record: 71951 (21/04/2026)
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NER/LNER Worsdell "D21" Class 4-4-0


Class Types
NER Class R1

General
Designer Wilson Worsdell
Introduced 1908
Pre-Grouping Company North Eastern Railway
Grouping Company London and North Eastern Railway
Wheel Arrangement 4-4-0
Number Built as D21 10
First in Service 11/1908
Last in Service 09/02/1946
Manufacturers
ManufacturerTotal
Darlington Works 10
Orders
BuilderSponsorOrder #DateSize
Darlington Works  381a 1908 10

Power
Variant Introduced 1908
Tractive Effort 17,026lbs
Inside Cylinders 19" x 26" (2 off)
Inside Valves 10"Piston
Inside Motion Stephenson

Wheels
Pony 3' 71⁄4"
Drivers 6' 10"
Locomotive Wheelbase 23' 9"
Tender Wheelbase 12' 8"
Total Wheelbase 47' 113⁄4"
Descriptive Wheelbase 6' 6" + 7' 9" + 9' 6" + 11' 6¾" 6' 4" + 6' 4"

Dimensions
Length (over buffers) 58' 81⁄4"
Weight (in running order) 105t 2cwt
Adhesive Weight 40t 12cwt
Maximum Axle Load 20t 16cwt
Water Capacity 4,125gal
Coal Capacity 5t 10cwt

Boiler & Firebox
Boiler Diagram 60
Boiler Max Diameter 5' 6"
Boiler Barrel Length 11' 6"
Boiler Pressure 175lbs
Boiler Pitch 8' 11"
Firebox Length 9'
Firebox Grate Area 27ft2
Firebox Heating Surface 158ft2
Tube Number 90
Tube Diameter 2"
Tube Area 529.875ft2
Flue Elements 24
Flue Diameter 51⁄4"
Flue Area 371ft2
Total Evaporative Area 1058.88ft2
Superheater Elements 24
Superheater Element Diameter 13⁄32"
Superheater Element Area 258ft2