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LNER Peppercorn "A1" Class 4-6-2


Class Types
LNER Class A1

General
Designer Peppercorn
Introduced 1948
Big Four London and North Eastern Railway
Description (1957) Class A1, a slightly modified version of class A1/1, built by Mr. A. H. Peppercorn in 1948 and 1949. 6'8" wheels, 250 lbs. pressure, 3 cylinders, 19 x 26 ins.
Wheels 4-6-2
Number Built as A1 50
Number Scrapped 49
Number Preserved 1
First in Service 06/08/1948
Last in Service 19/06/1966
Manufacturers
ManufacturerTotal
Darlington Works 23
Doncaster Works 26
Orders
BuilderOrder #DateSize
Doncaster Works 382 11/1945 10
Doncaster Works 383 11/1945 6
Darlington Works n/a 01/1947 23
Doncaster Works 388 08/1948 10

Illustration
Copyright: RicsRailPics
Power
Standard Timken
Variant Introduced 1948 1949
Miscellaneous Differences   Timken Roller Bearings
Tractive Effort 37,397lbs
As Standard
Inside Cylinders 19" x 26" (1 off)
As Standard
Inside Valves 10"Piston
As Standard
Inside Motion Walschaerts
As Standard
Outside Cylinders 19" x 26" (2 off)
As Standard
Outside Valves 10"Piston
As Standard
Outside Motion Walschaerts
As Standard

Wheels
Standard Timken
Pony 3' 2"
As Standard
Drivers 6' 8"
As Standard
Truck 3' 8"
As Standard
Locomotive Wheelbase 36' 3"
As Standard
Tender Wheelbase 16'
As Standard
Total Wheelbase 62' 514"
As Standard
Descriptive Wheelbase 6' 3" + 5' 9" + 7' 3" + 7' 3" + 9' 9" + 10 2¼" + 5' 3" + 5' 6" + 5' 3" = 62 5¼"
As Standard

Dimensions
Standard Timken
Length (over buffers) 72' 1134"
As Standard
Weight (in running order) 164t 9cwt 166t 2cwt
Weight (loco only) 104t 2cwt 105t 4cwt
Adhesive Weight 66t 0cwt 66t 11cwt
Maximum Axle Load 22t 0cwt 22t 7cwt
Water Capacity 5,000gal
As Standard
Coal Capacity 9t 0cwt
As Standard

Boiler & Firebox
Standard Timken
Boiler Diagram 118
As Standard
Boiler Max Diameter 6' 5"
As Standard
Boiler Barrel Length 16' 1158"
As Standard
Boiler Pressure 250lbs
As Standard
Boiler Pitch 9' 412"
As Standard
Firebox Length 11' 418"
As Standard
Firebox Grate Area 50ft2
As Standard
Firebox Heating Surface 245.3ft2
As Standard
Tube Number 121
As Standard
Tube Diameter 214"
As Standard
Tube Area 1211.57ft2
As Standard
Flue Elements 43
As Standard
Flue Diameter 514"
As Standard
Flue Area 1004.5ft2
As Standard
Total Evaporative Area 2461.37ft2
As Standard
Superheater Elements 43
As Standard
Superheater Element Diameter 1.244"
As Standard
Superheater Element Area 679.67ft2
As Standard
Total Heating Area 3141.04ft2
As Standard