List of railway companies involved in the 1923 Grouping

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Under the Railways Act 1921 the majority of the railway companies in Great Britain (along with a few in Northern Ireland) were grouped into four main companies, often termed the Big Four. The grouping took effect from 1 January 1923.

The Big Four[change | change source]

The Big Four and their constituent companies, showing route mileage, were:

Companies not covered by the grouping[change | change source]

Over fifty railway companies were not covered by the grouping. These small railway companies kept their independence.