LMS Stanier Class 5 4-6-0 No. 45212 is a preserved British steam locomotive. It was built by Armstrong Whitworth at Newcastle upon Tyne in 1935.

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Quick Facts Type and origin, Power type ...

LMS 5212
45212 Running round its train at Oxenhope.
Type and origin Power type Steam Designer William Stanier Builder Armstrong Whitworth Serial number 1253 Build date November 1935
Specifications Configuration: ​  • Whyte 4-6-0 Gauge 4 ft 8+1⁄2 in (1,435 mm) Leading dia. 3 ft 3+1⁄2 in (1.003 m) Driver dia. 6 ft 0 in (1.829 m) Length 63 ft 7+3⁄4 in (19.40 m) Fuel type Coal Fuel capacity 9 long tons (9.1 t; 10.1 short tons) Water cap. 4,000 imp gal (18,000 L; 4,800 US gal) Firebox: ​  • Grate area 28+1⁄2 sq ft (2.65 m2) Boiler LMS type 3C Boiler pressure 225 lbf/in2 (1.55 MPa) Cylinders Two, outside Cylinder size 18+1⁄2 in × 28 in (470 mm × 711 mm) Valve gear Walschaerts Valve type Piston valves Loco brake Vacuum Safety systems AWS, TPWS, OTMR, GSMR
Performance figures Maximum speed 25mph - (heritage railways) 45mph - (mainline, tender first) 60mph - (mainline, chimney first) Tractive effort 25,455 lbf (113.23 kN)
Career Operators London, Midland and Scottish Railway → British Railways Power class LMS: 5P5F BR: 5MT Axle load class BR: Route Availability 7 Withdrawn 3 August 1968 Current owner KWVR (On loan to Ian Riley) Disposition Operational, Mainline Certified

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It is a LMS Stanier Class 5 4-6-0 locomotive, originally numbered 5212 by the LMS, it had 40000 added to its number under British Railways after nationalisation in 1948. 45212 was one of the last locomotives to be withdrawn from service, surviving until 1968, the last year of steam on British Railways.

In August 1968, Ron Ainsworth purchased 45212 directly from British Railways service for use on the Keighley & Worth Valley Railway, so never had to be restored from scrapyard condition, and is now owned by the Keighley & Worth Valley Railway. Between 2000 and 2011, it was overhauled and operated at the North Yorkshire Moors Railway,^[1] but was not able to run trains into Whitby or Battersby as it was not mainline certified.

In 2012 an agreement was reached with Ian Riley for a 10 year period where the locomotive would be overhauled to mainline standards, while spending 3 months of the year at the Keighley & Worth Valley Railway. Following the 2016 completion of an overhaul at Riley's workshop in Bury, the engine is now mainline certified, and is operated by them on the main line, alongside Black 5s 44871 and 45407.^[2]