It was the LMS. The
London, Midland and Scottish Railway (
LMS) was a British railway company formed on 1 January 1923 under the
Railways Act of 1921, which required the grouping of over 120 separate railways into four. The companies merged into the LMS included the
London and North Western Railway,
Midland Railway, the
Lancashire and Yorkshire Railway (which had previously merged with the London and North Western Railway on 1 January 1922), several Scottish railway companies (including the
Caledonian Railway), and numerous other, smaller ventures.