LNER Thompson Class B1 61306

LNER 61306 Mayflower
Mayflower at Doncaster Works in 2003
Type and origin Power type Steam Designer Edward Thompson Builder North British Locomotive Company, Glasgow Order number L963 Serial number 26207 Build date April 1948
Specifications Configuration: ​  • Whyte 4-6-0  • UIC 2′C h2 Gauge 4 ft 8+1⁄2 in (1,435 mm) Leading dia. 3 ft 2 in (0.965 m) Driver dia. 6 ft 2 in (1.880 m) Loco weight 71 long tons 3 cwt (159,400 lb or 72.3 t) Fuel type Coal Water cap. 4,000 imp gal (18,000 L; 4,800 US gal) Boiler LNER diagram 100A Boiler pressure 225 psi (1.55 MPa) Cylinders Two (outside) Cylinder size 20 in × 26 in (508 mm × 660 mm) Valve gear Walschaerts Valve type 10-inch (254 mm) piston valves
Performance figures Tractive effort 26,878 lbf (119.56 kN)
Career Operators British Railways Power class 5MT Axle load class Route Availability 5 Withdrawn September 1967 Current owner Locomotive Services Group Disposition Operational, mainline certified

LNER Thompson Class B1 No. 61306 Mayflower is a 4-6-0 steam locomotive built in 1948 at the North British Locomotive Company to a design by Edward Thompson. It was employed for hauling mixed traffic trains on British Railways' Eastern, North Eastern, and Scottish Regions until it was bought for preservation in 1967, during which it was renumbered and given its current name.

In 2019, Mayflower emerged from an extensive overhaul and is certified for running on the British mainline.