SECR B1 class

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SECR B1 class
B1 at Tonbridge Locomotive Depot 18 May 1946
Type and origin Power type Steam Designer James Stirling Builder Neilson, Reid and Company (20) Ashford Works (9) Build date 1898–1899 (as B class) Total produced 29 Rebuild date 1910–1926 (as B1 class) Number rebuilt 27
Specifications Configuration: ​  • Whyte 4-4-0  • UIC 2′B Gauge 4 ft 8+1⁄2 in (1,435 mm) Driver dia. 7 ft 0 in (2.134 m) Loco weight 45 long tons 2 cwt (101,000 lb or 45.8 t) Fuel type Coal Boiler pressure 170 lbf/in2 (1.17 MPa) Cylinders Two, inside Cylinder size 18 in × 26 in (457 mm × 660 mm)
Performance figures Tractive effort 14,490 lbf (64.45 kN)
Career Operators South Eastern and Chatham Railway → Southern Railway → Southern Region of British Railways Class SECR/SR: B1 Withdrawn 1930–1951 Disposition All scrapped

The SECR B1 class was a class of 4-4-0 steam tender locomotive for express passenger service on the South Eastern and Chatham Railway. These engines were originally designed by James Stirling for the South Eastern Railway (SER) in 1898 and designated B class. The SER was merged into the SECR in 1899 and, between 1910 and 1927 the B class engines were rebuilt with new boilers by Harry Wainwright to become B1 class.