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LNER Gresley "A4" Class 4-6-2


Class Types
LNER Class A4

General
Designer Gresley
Introduced 1935
Big Four London and North Eastern Railway
Description (1957) Class A4 Gresley streamlined Pacifics. The original four engines (now 60014-7) were introduced in 1935 for working the 'Silver Jubilee', Britain's first high speed completely streamlined train. Additional engines were completed 1936-38 for other similar services and for general main line work. No. 60022, Mallard, holds the world's highest authenticated speed for steam, 126½ m. p. h. attained on a test run on 7 July, 1938. 6'8" wheels, 250 lbs. pressure, 3 cylinders, 18% X 26 ins.
Wheels 4-6-2
Number Built as A4 35
First in Service 07/09/1935
Last in Service 05/09/1966
Manufacturers
ManufacturerTotal
Doncaster Works 35
Orders
BuilderOrder #DateSize
Doncaster Works 338 03/1935 4
Doncaster Works 340 01/1936 10
Doncaster Works 341 01/1936 7
Doncaster Works 341A 11/1936 3
Doncaster Works 342 11/1936 10
Doncaster Works 343 11/1936 1

Illustration
Copyright: Gerald Robinson
Power
A4 A4/1
Variant Introduced 1935 1947
Miscellaneous Differences   Inside cylinder lined up to 17" in order to balance the power output at certain cut-off's against the outside cylinders.
Tractive Effort 35,455lbs 33,616lbs
Inside Cylinders 18.5" x 26" (1 off) 17" x 26" (1 off)
Inside Valves 9"Piston
As A4
Inside Motion Walschaerts/Gresley
As A4
Outside Cylinders 18.5" x 26" (2 off)
As A4
Outside Valves 9"Piston
As A4
Outside Motion Walschaerts/Gresley
As A4

Wheels
A4 A4/1
Pony 3' 2"
As A4
Drivers 6' 8"
As A4
Truck 3' 8"
As A4
Locomotive Wheelbase 35' 9"
As A4
Tender Wheelbase 16'
As A4
Total Wheelbase 60' 1058"
As A4
Descriptive Wheelbase 6' 3" + 5' 6" + 7' 3" + 7' 3" + 9' 6" + (10' 1⅝") + 5' 3" + 5' 6" + 5' 3" = 60' 10⅝"
As A4

Dimensions
A4 A4/1
Length (over buffers) 71' 038"
As A4
Weight (loco only) 102t 19cwt
As A4
Adhesive Weight 66t 0cwt
As A4
Maximum Axle Load 22t 0cwt
As A4
Water Capacity 5,000gal
As A4
Coal Capacity 9t 0cwt
As A4

Boiler & Firebox
A4 A4/1
Boiler Diagram 107
As A4
Boiler Max Diameter 6' 5"
As A4
Boiler Barrel Length 17' 1134"
As A4
Boiler Pressure 250lbs
As A4
Boiler Pitch 9' 412"
As A4
Firebox Length 10' 534"
As A4
Firebox Grate Area 41.25ft2
As A4
Firebox Heating Surface 231.2ft2
As A4
Tube Number 121
As A4
Tube Diameter 214"
As A4
Tube Area 1281.4ft2
As A4
Flue Elements 43
As A4
Flue Diameter 514"
As A4
Flue Area 1063.7ft2
As A4
Total Evaporative Area 2576.3ft2
As A4
Superheater Elements 43
As A4
Superheater Element Diameter 1.244"
As A4
Superheater Element Area 748.9ft2
As A4
Total Heating Area 3325.2ft2
As A4