The London, Midland and Scottish Railway Company

 The first CME of the new company was Hughes, from the L&Y, who stepped down after only a year. He was followed by Fowler, the ex-Midland CME, who was recommended by Beames (ex LNWR CME) who was offered the job, being next in seniority to Hughes. Fowler developed a number of new "standard" locomotives for the company. These new standard classes, although they betrayed a Derby influence, did not follow the Derby "small is the only way" philosophy. Under Fowler, the LMS acquired the express passenger Royal Scot class, the Class 4 freight loco 0-6-0, the unsuccessful "Austin Seven" 0-8-0 heavy freight, 2F "Jinty" 0-6-0T, Patriot 4-6-0 passenger loco - a rebuild of the LNWR Claughtons, 2-6-4T express passenger tank loco, a 3P 2-6-2T passenger tank, and others. When Fowler retired the directors decided to appoint William Stanier to the post of CME in 1932. Stanier came from the GWR and brought a new injection of life into LMS loco design. His locomotives can be distinguish from Fowlers as they had tapered boilers and different cab sides. His first project was a 2-6-0 mixed traffic loco, and was soon followed by the "Black 5" 5P5F 4-6-0 class, 4-6-0 passenger class "Jubilee", 4-6-2 Princess Royal class, 4-6-2 Streamlined Coronation class, 4-6-2 Princess Coronation class, 2-8-0 8F heavy freight, 2-6-4T a Stanier version of Fowlers sucessful 2-6-4T design, 2-6-2T 3P which was not as sucessful as Fowlers 3P tank and others. Stanier was initially followed Fairburn who was suceeded by Ivatt who in his short tenure produced three excellent locos a Class 2 and class 3 2-6-0, and a 2P 2-6-2T, all three influencing the BR standard designs of Riddles. It's main lines were:

 ex-LNWR
London (Euston) - Rugby
Rugby - Birmingham - Wolverhampton - Stafford
Rugby - Stafford - Crewe - Preston - Carlisle
Crewe - Chester - Holyhead - Dublin (via Ferry)
Crewe - Manchester
Crewe - Liverpool
Manchester - Leeds

ex-MR
London (St. Pancras) - Bedford -Leicester
Leicester - Nottingham - Sheffield
Leicester - Derby - Matlock - Manchester
Sheffield - Leeds - Settle - Carlisle

ex-MR NCC - Northern Counties Committee - Ireland
Belfast - Greenisland - Carrickfergus - Larne
Greenisland - Ballymena - Coleraine - Londonderry (Waterside)

ex-L&Y
Leeds - Manchester - Liverpool
Preston - Manchester

ex-CR and GSWR
Carlisle - Carstairs - Glasgow
Carlisle - Dumfries - Glasgow
Dumfries - Newtown Stewart - Stranraer (ferry for Larne, N.Ireland)
Carstairs - Edinburgh
Glasgow - Perth - Inverness - Wick and Thurso