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

**Class Types**
GNR Class	D1
LNER Class	D1

General

Designer

Henry Ivatt

Introduced

1911

Pre-Grouping Company

Great Northern Railway

Grouping Company

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.

Wheel Arrangement

4-4-0

Number Built as D1

First in Service

03/1911

Last in Service

11/1950

Manufacturers

Manufacturer	Total
Doncaster Works	15

Orders

Builder	Sponsor	Order #	Date	Size
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' 1¹⁄₂"
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' 11¹⁄₄"
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' 2¹⁄₂"
Firebox Length	6' 4"
Firebox Grate Area	19ft²
Firebox Heating Surface	120ft²
Tube Number	118
Tube Diameter	1³⁄₄"
Tube Area	562ft²
Flue Elements	18
Flue Diameter	5¹⁄₄"
Flue Area	257ft²
Total Evaporative Area	937ft²
Superheater Elements	18
Superheater Element Diameter	1¹⁄₄"
Superheater Element Area	192ft²
Total Heating Area	1129ft²

Complete BR Locomotive Database 1948-1997

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