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GNR/LNER Ivatt "D1" Class 4-4-0


Class Types
GNR Class D1
LNER Class D1

General
Designer Ivatt
Introduced 1911
Pre-Grouping Great Northern Railway
Big Four London and North Eastern Railway
Description (1957) Classes D1 and D2. G.N.R. Ivatt 6'8" 4-4-0's, built 1898-1909 (class D2), and 1911 (class Dl, Nos. 62203 upwards). In the two classes there were originally 85 locomotives. Some class D2 engines were superheated and as such were similar in appearance to the slightly more powerful Dl's. Nos. 62150 ,4ind 62152-4 had flat running plates and resembled class D3. Class Dl engines were dual fitted with Westinghouse in addition to vacuum brakes. All were scrapped by 1951.
Wheels 4-4-0
Number Built as D1 15
First in Service 03/1911
Last in Service 11/1950
Manufacturers
ManufacturerTotal
Doncaster Works 15
Orders
BuilderOrder #DateSize
Doncaster Works 265 01/1911 15

Power
Variant Introduced 1911
Tractive Effort 16,074lbs
Inside Cylinders 18.5" x 26" (2 off)
Inside Valves 8"Piston
Inside Motion Stephenson

Wheels
Pony 3' 8"
Drivers 6' 8"
Locomotive Wheelbase 22' 112"
Tender Wheelbase 13'
Total Wheelbase 43' 8"
Descriptive Wheelbase 6' 5½" + 6' 8" + 9' 0" + 8' 6½" + 7' 0" + 6' 0" = 43' 8"

Dimensions
Length (over buffers) 52' 1114"
Weight (in running order) 96t 8cwt
Adhesive Weight 35t 10cwt
Maximum Axle Load 18t 0cwt
Water Capacity 3,500gal
Coal Capacity 6t 10cwt

Boiler & Firebox
Boiler Diagram 7Sup
Boiler Max Diameter 4' 8"
Boiler Barrel Length 10' 1"
Boiler Pressure 170lbs
Boiler Pitch 8' 212"
Firebox Length 6' 4"
Firebox Grate Area 19ft2
Firebox Heating Surface 120ft2
Tube Number 118
Tube Diameter 134"
Tube Area 562ft2
Flue Elements 18
Flue Diameter 514"
Flue Area 257ft2
Total Evaporative Area 937ft2
Superheater Elements 18
Superheater Element Diameter 114"
Superheater Element Area 192ft2
Total Heating Area 1129ft2