EntityQ221905· pop 7· linked from 144 articlesBig FourSign in to savegrouping of companies formed as a result of the Railways Act 1921 in the United Kingdom from 1923 to 1947ConnectionsBritish RailEntityUnited KingdomCountryWorld War IIConceptrail transportEntitynationalizationEntityForth BridgeEntityNewton AbbotEntityGreat Western RailwayEntityLondon and North Eastern RailwayEntityLondon, Midland and Scottish RailwayEntitySouthern RailwayEntityMidland RailwayEntityGreat Eastern RailwayEntityLancashire and Yorkshire RailwayEntityLondon Passenger Transport BoardEntityGreat Northern RailwayEntityLondon and North Western RailwayEntityCaledonian RailwayEntityLondon and South Western RailwayEntityRailways Act 1921EntityCategoriesBig four British railway companies