LNER Peppercorn Class A1

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LNER Peppercorn Class A1
A1 Class No. 60118 Archibald Sturrock 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1 completed in 2008 Numbers 60114–60162, 60163 Locale North Eastern Region First run August 1948 Last run June 1966 Withdrawn October 1962–June 1966 Disposition Original 49 withdrawn and scrapped, 1 built in 2008 and Mainline Registered

London and North Eastern Railway's (LNER) Peppercorn Class A1 is a class of 4-6-2 "Pacific" steam locomotives largely 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.