The London and North Eastern Railway

London and North Eastern Railway

The London and North Eastern Railway was the second-largest of the "Big Four" railway companies created by the Railways Act 1921 in Britain...

 Class P1 Mineral 2-8-2 Mikado was a class of 2 steam locomotive

Steam locomotive

A steam locomotive is a railway locomotive that produces its power through a steam engine. These locomotives are fueled by burning some combustible material, usually coal, wood or oil, to produce steam in a boiler, which drives the steam engine...

s designed by Nigel Gresley

Nigel Gresley

Sir Herbert Nigel Gresley was one of Britain's most famous steam locomotive engineers, who rose to become Chief Mechanical Engineer of the London and North Eastern Railway . He was the designer of some of the most famous steam locomotives in Britain, including the LNER Class A1 and LNER Class A4...

. They were some of the most powerful freight locomotives ever designed in Britain, and it was initially intended they be a more powerful 2-10-0

2-10-0

Under the Whyte notation for the classification of steam locomotives, 2-10-0 represents the wheel arrangement of two leading wheels on one axle, ten powered and coupled driving wheels on five axles, and no trailing wheels...

 version of the earlier Class O2 2-8-0

2-8-0

Under the Whyte notation for the classification of steam locomotives, 2-8-0 represents the wheel arrangement of two leading wheels on one axle , eight powered and coupled driving wheels on four axles, and no trailing wheels...

s. The design was submitted in August 1923, for use between Peterborough

Peterborough

Peterborough is a cathedral city and unitary authority area in the East of England, with an estimated population of in June 2007. For ceremonial purposes it is in the county of Cambridgeshire. Situated north of London, the city stands on the River Nene which flows into the North Sea...

 and London

London

London is the capital city of :England and the :United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its...

, and also between Immingham

Immingham

Immingham is a town in North East Lincolnshire, located on the south bank of the Humber Estuary...

 and Wath Yard. The power was quoted as being 25% more than the O2.

There were two locomotives built: No. 2393 was completed in June 1925, whilst No. 2394 was completed in November. They differed in the main by having different superheater

Superheater

A superheater is a device used to convert saturated steam or wet steam into dry steam used for power generation or processes. There are three types of superheaters namely: radiant, convection, and separately fired...

s fitted. There were four others planned to replace older 0-8-0

0-8-0

Under the Whyte notation for the classification of steam locomotives, 0-8-0 represents the wheel arrangement of no leading wheels, eight powered and coupled driving wheels on four axles, and no trailing wheels...

 locomotives, but these were never built. They were initially put to work between New England and Ferme Park yards, which was the only route deemed suitable for them. However, they were only economically viable when hauling heavier trains of 1000 tons or more, loads which were comparatively rare on Britain's railways at that time. The locomotives were finally withdrawn in July 1945, and the boilers used to rebuild Class A1 Nos. 2557 and 2565 to Class A3, and the tenders modified and used on Thompson Class B2

LNER Thompson Class B2

The London and North Eastern Railway Thompson Class B2 was a class of 4-6-0 steam locomotive. It was introduced in 1945 as a two-cylinder rebuild of the three-cylinder LNER Class B17. Ten were rebuilt from Class B17 but no more were rebuilt because of the success of the LNER Thompson Class B1...

locomotives, so neither survived into preservation.