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Newton Class 2-4-0 Locomotive Class
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A class of 96 2-4-0 express engines with 6ft 6in driving wheels
 built under Ramsbottom and Webb from 1866 to 1873. They were developed from the ‘DX’ 0-6-0 and were intended for express passenger working on the Lancaster & Carlisle, where the ‘Problems’ were having difficulties in adverse weather conditions. All were ‘rebuilt’ (actually replaced by) ‘Large Jumbos’ by the early 1890’s.
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Patent 2-2-2 Locomotive Class
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In 1852 McConnell produced his ‘Patent’ 2-2-2s to work the London–Birmingham trains in two hours. They had outside bearings and the boiler was pitched very low, with a recess to accommodate the cranks and upward inclined cylinders. The ‘patent’ feature was the design of the firebox which had a combustion chamber to burn coal instead of coke.
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Pennsylvania
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A locomotive of the “Teutonic” class, ordered by the Pennsylvania Railroad for a trial of Webb’s compounding system. Various locomotive builders objected, successfully, that as a Railway Company the LNWR was entitled to build locomotives for itself but not to trade in locomotives.
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Precedent 2-4-0 Locomotive Class
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The ‘Precedents’ were the 6ft 6in counterparts of the 5ft 6in ‘Precursors’ and were introduced in December 1874. They had 140 psi Boilers and 7/8in frames, a cab, Webb’s closed safety valves and no brakes on the engine.
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Precursor 2-4-0 Locomotive Class (1)
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A series of 2-4-0’s built by F.W. Webb from 1874 with 5ft 6in driving wheels thought to be better suited to hill climbing on the Crewe-Carlisle line; where as the ‘Precedents’ although similar in many other aspects had 6ft 6in wheels. Precursor had the usual Webb features, plain chimney top, a cab, they also had open Ramsbottom safety Valves, horizontal smoke box door, hook-type front coupling and no brakes on the engine. They were all replaced by 2-4-2 5ft 6in tank engines from 1890.
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Precursor 4-4-0 Locomotive Class (2)
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A class of 130 very successful 4-4-0 express passenger engines built by George Whale from 1904. After the value of superheating was proved many of the class received superheater boilers with extended smoke boxes and their performance was then indistinguishable from the “George the Fifths”; they retained separate splashers over the driving wheels and so were different in appearance. They were the first of Whale’s larger engines and the last one was not scrapped until 1949.
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Precursor Tank Locomotive Class
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A 4-4-2 tank locomotive developed from Whale’sPrecursor passenger engines.
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Prince of Wales 4-6-0 Locomotive Class
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A class of 4-6-0 locomotives built by Bowen Cooke from 1911 – the superheated version of the Whale “Experiment” class (as “George the Fifth” was of the “Precursor” class) and the main work-horse of LNWR express passenger services from its introduction. During the First World War, some were built by outside companies and not at Crewe.
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Problem 2-2-2 Locomotive Class
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Designed by John Ramsbottom and introduced in 1859, the first of the ‘7ft 6in Single’ class was No.184 Problem. This name came from a withdrawn Trevithick 2-4-0 goods engine and originally had a mathematical connotation, another of the class being Theorem. They incorporated all the usual Ramsbottom features: his design of chimney top, safety valves and screw reverser, horizontal smoke box door, no cab, no brakes on the engine and no top lamp socket. The class is also known by one of the famous members of the class ‘Lady of the Lake’ as it was awarded a bronze medal at the International Exhibition in 1862
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Pug Locomotive Class
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A common term in Scotland for a small shunting locomotive – typically an 0-4-0 tank. ‘Pug’ was a dialect word meaning ‘monkey’.
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Renown Locomotive Class
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In 1908 Whale began converting Webb’s “Jubilee” class into two-cylinder simple engines, by taking off the outside cylinders, lining up the inside cylinders to 18½ inches and fitting “Alfred the Great” boilers and Precursor-style cabs — in effect making them into smaller “Precursors”. The first of these conversions was to 1918 “Renown”, which gave its name to the whole class. Though these conversions went ahead quite slowly, almost all “Jubilees” and most “Benbows” were eventually converted.
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