ERA 01 (1804-1875 Pioneering)
ERA 02 (1875-1922 Pre-Grouping)
ERA 03 (1923-1947 The Big Four LMS,GWR,LNER and SR)
ERA 04 (1948-1956 British Railways Early Emblem)
ERA 05 (1957-1966 British Railways Late Crest)
ERA 06 (1967-1971 British Rail Blue Pre-TOPS)
ERA 07 (1971-1982 British Rail Blue TOPS)
ERA 08 (1982-1994 British Rail Sectorisation)
ERA 09 (1995-Present Day)