Under this act, almost all of the hundreds of existing rail companies were grouped together into four new companies:* London, Midland and Scottish Railway (LMS)* Great Western Railway (GWR)* London and North Eastern Railway (LNER)* Southern Railway (SR)This "grouping" had first been proposed in the 1850s, and lasted from 1 January 1923 to 31 December 1947.
В 1921 году был издан закон о железных дорогах согласно которому почти все из сотен существовавших до этого железнодорожных компаний были объединены в четыре новые компании: Great Western Railway (GWR), London, Midland and Scottish Railway (LMS), London and North Eastern Railway (LNER), Southern Railway (SR).