This article is about the locomotives built in 1948–49. For other LNER Class A1 locomotives, see LNER Class A1. For the new locomotive completed in 2008, see LNER Peppercorn Class A1 60163 Tornado.
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LNER Peppercorn Class A1
An A1 Class locomotive at Kings Cross "Top Shed", circa May 1963
Type and origin
Power type
Steam
Designer
Arthur Peppercorn
Builder
Doncaster Works Darlington Works
Build date
1948–1949, 2008
Total produced
49
Specifications
Configuration:
• Whyte
4-6-2
Leading dia.
3 ft 2 in (0.965 m)
Driver dia.
6 ft 8 in (2.032 m)
Trailing dia.
3 ft 8 in (1.118 m)
Length
72 ft 11+3⁄4 in (22.24 m)
Width
9 ft 2+7⁄8 in (2.82 m)
Height
13 ft 1 in (3.99 m)
Axle load
22.1 long tons (22.5 t; 24.8 short tons)
Adhesive weight
66.55 long tons (67.62 t; 74.54 short tons)
Loco weight
105.2 long tons (106.9 t; 117.8 short tons)
Tender weight
60.9 long tons (61.9 t; 68.2 short tons)
Total weight
166.1 long tons (168.8 t; 186.0 short tons)
Fuel type
Coal
Fuel capacity
9 long tons (9.1 t; 10 short tons)
Water cap.
5,000 imp gal (23,000 L; 6,000 US gal)
Firebox:
• Grate area
50.0 sq ft (4.65 m2)
Boiler
Diagram 118 6 ft 5 in (1.96 m) diameter 29 ft 2 in (8.89 m) length
Boiler pressure
250 psi (1,700 kPa)
Heating surface:
• Firebox
245.3 sq ft (22.79 m2)
• Tubes
1,211.6 sq ft (112.56 m2)
• Flues
1,004.5 sq ft (93.32 m2)
• Total surface
2,461.4 sq ft (228.67 m2)
Superheater:
• Heating area
697.7 sq ft (64.82 m2)
Cylinders
3
Cylinder size
19 in × 26 in (483 mm × 660 mm)
Valve gear
Walschaerts
Performance figures
Maximum speed
100 mph (160 km/h)
Power output
2,700 hp (2,000 kW)[citation needed]
Tractive effort
37,400 lbf (166 kN)
Career
Operators
British Railways
Power class
BR: 8P6F
Number in class
49 original, 1 completed in 2008
Numbers
60114–60162, 60163
Locale
North Eastern Region
First run
August 1948
Last run
June 1966
Withdrawn
October 1962–June 1966
Disposition
Original 49 withdrawn and scrapped, 1 built in 2008 and Mainline Registered
60133 Pommern passing Leeds-Holbeck High Level Station hauling Leeds Central to Kings Cross Yorkshire Pullman60131 Osprey at Leeds Neville Hill locomotive shed on 18 April 1965
London and North Eastern Railway's (LNER) Peppercorn Class A1 is a class of 4-6-2 "Pacific" steam locomotives built between 1948 and 1949 at Doncaster and Darlington Works to a design of Arthur Peppercorn. Forty-nine were built for hauling express passenger services on the East Coast Main Line owned by LNER's successor, British Railways' North Eastern Region. None of the original 49 Peppercorn A1s survived into preservation, with the last being scrapped in 1966. The 50th Peppercorn A1, 60163 Tornado, was completed in 2008 as an evolved member of its class.
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