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Era 2 - Pre-Grouping (1875 - 1922)
Era 3 - The Big Four (1923-1947)
Era 4 - British Railways Steam Era (1948-1956)
Era 5 - British Railways (1957-1966)
Era 8 - British Rail Sectorisation (1982-1994)
Era 9 - Post privatisation (1995 onwards)