The London and North Eastern Railway Class P1 Mineral 2-8-2 Mikado was a class of two steam locomotives designed by Nigel Gresley. They were two of the most powerful freight locomotives ever designed for a British railway.

The Gresley P1 Mineral 2-8-2 (Mikado) Locomotives Even before Grouping (1923), Gresley was considering the design of a mineral locomotive more powerful than his O2 2-8-0. Initially, he considered a 2-10-2 design but this was changed to that of a 2-8-2 Mikado by 1923.

The London and North Eastern Railway (LNER) produced several classes of locomotive, mostly to the designs of Nigel Gresley, characterised by a three-cylinder layout with a parallel boiler and round-topped firebox.

The NER Class P1 (LNER Class J25) was a class of 0-6-0 steam locomotives of the North Eastern Railway. [1][2] Class P1 was a development of Class P, having a boiler four inches longer, and a firebox six inches longer.

The two P1 locomotives were built to haul heavy mineral trains into London, but operational limitations meant they were difficult to run efficiently. The P2 s included " Cock o'the North ", and received much more publicity.

Jul 18, 2018 · A steam pipe ran from the engine’s boiler to the 2-cylindered booster. 8,500 lb/f was produced by the booster, with the engine itself making 38,500 lb/f, 47,000 lb/f of tractive …

This new locomotive, the NER Class P1 (LNER J25) used a boiler of the same size as that on the earlier J21 (NER Class C). Compared to the J24 boiler, this boiler was 4in longer and had a 6in longer firebox.

*See “Read Me/Manual” included for Quick drive Compatibility DLC compatibility* Size: 963MB. https://www.lner.info/locos/P/p1.php.

The LNER originally planned a locomotive with a 2-10-0 wheel arrangement as a more powerful successor to the GNR Class O2. Ultimately, the two class P1 locomotives were built in 1925 and had the wheel arrangement 2-8-2.

The P1, No. 2394, received a standard 32-element superheater in November 1931, without a boiler change. The “E” type having proved unsuccessful Gresley asked Doncaster (8 January 1927) to consider increasing the number of flues in the conventional Robinson superheater.