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LNER Gresley "P1" Class 2-8-2


Class Types
LNER Class P1

General
Designer Gresley
Introduced 1925
Big Four London and North Eastern Railway
Wheels 2-8-2
Number Built as P1 2
Number Scrapped 2
Number Preserved 0
First in Service 27/06/1925
Last in Service 24/07/1945
Manufacturers
ManufacturerTotal
Doncaster Works 2
Orders
BuilderOrder #DateSize
Doncaster Works 303 11/1923 2
Historical Data Designed for working 100 wagon coal trains between Ferme Park (London) and New England (Peterborough), and also, in theory, between Wath and Immingham via the Doncaster avoiding line.
The boosters weren't used that much and were removed just prior to WWII.
A3 style high pressure boilers were fitted during the war and, on withdrawal, were used to convert two A1's to A3's.

Power
P1 P1 HP
Variant Introduced 1925 1938
Tractive Effort 38,500lbs 42,466lbs
Booster Tractive Effort 8,500lbs
As P1
Inside Cylinders 20" x 26" (1 off)
As P1
Inside Valves 8"Piston
As P1
Inside Motion Gresley
As P1
Outside Cylinders 20" x 26" (2 off)
As P1
Outside Valves 8"Piston
As P1
Outside Motion Walschaerts
As P1

Wheels
P1 P1 HP
Pony 3' 2"
As P1
Drivers 5' 2"
As P1
Truck 3' 8"
As P1
Locomotive Wheelbase 36' 2"
As P1
Tender Wheelbase 13'
As P1
Total Wheelbase 59' 8"
As P1
Descriptive Wheelbase 8' 8" + 6' 6" + 6' 0" + 6' 0" + 9' 0" + 10' 6" + 6' 6" + 6' 6" = 59' 8"
As P1

Dimensions
P1 P1 HP
Length (over buffers) 69' 10"
As P1
Weight (in running order) 151t 8cwt 146t 4cwt
Weight (loco only) 100t 0cwt 94t 16cwt
Adhesive Weight 89t 14cwt 69t 5cwt
Maximum Axle Load 18t 13cwt 17t 15cwt
Water Capacity 4,700gal
As P1
Coal Capacity 7t 0cwt
As P1

Boiler & Firebox
P1 P1 HP
Boiler Diagram 94 94HP/94A
Boiler Max Diameter 6' 5" 6' 5"
Boiler Barrel Length 19' 18' 1134"
Boiler Pressure 180lbs 220lbs
Boiler Pitch 9' 412"
As P1
Firebox Length 9' 512" 9' 534"
Firebox Grate Area 41.25ft2 41.25ft2
Firebox Heating Surface 215ft2 215ft2
Tube Number 168 121
Tube Diameter 214" 214"
Tube Area 1880ft2 1354.6ft2
Flue Elements 32 43
Flue Diameter 514" 514"
Flue Area 835ft2 1122.8ft2
Total Evaporative Area 2930ft2 2692ft2
Superheater Elements 32 43
Superheater Element Diameter 114" 1.244"
Superheater Element Area 525ft2 706ft2
Total Heating Area 3455ft2 3398ft2