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GNR/LNER Ivatt "D4" Class 4-4-0


Class Types
GNR Class D2
LNER Class D4

General
Designer Ivatt
Introduced 1896
Pre-Grouping Great Northern Railway
Big Four London and North Eastern Railway
Wheels 4-4-0
Number Built as D4 51
First in Service 12/1896
Last in Service 10/1951
Manufacturers
ManufacturerTotal
Doncaster Works 51
Orders
BuilderOrder #DateSize
Doncaster Works n/a 10/1896 1
Doncaster Works 201 03/1897 10
Doncaster Works 204 08/1897 10
Doncaster Works 207 01/1898 10
Doncaster Works 213 10/1898 10
Doncaster Works 219 09/1899 10

Illustration
Copyright: John Law
Power
Variant Introduced 1896
Tractive Effort 14,805lbs
Inside Cylinders 17.5" x 26" (2 off)
Inside Valves Slide
Inside Motion Stephenson

Wheels
Pony 3' 8"
Drivers 6' 8"
Locomotive Wheelbase 21' 3"
Tender Wheelbase 13'
Total Wheelbase 42' 10"
Descriptive Wheelbase 6' 3" + 6' 9" + 8' 3", 6' 6" + 6' 6"

Dimensions
Length (over buffers) 52' 234"
Weight (in running order) 82t 17cwt
Adhesive Weight 27t 18cwt
Maximum Axle Load 14t 9cwt
Water Capacity 3,170gal
Coal Capacity 6t 0cwt

Boiler & Firebox
Boiler Diagram 11
Boiler Max Diameter 4' 5"
Boiler Barrel Length 10' 1"
Boiler Pressure 175lbs
Boiler Pitch 7' 534"
Firebox Length 5' 6"
Firebox Grate Area 16.25ft2
Firebox Heating Surface 103ft2
Tube Number 213
Tube Diameter 134"
Tube Area 1016ft2
Total Evaporative Area 1119ft2