In 1957 British Railways changed the principal paint scheme for passenger coaches to a maroon livery, similar to the former Midland/LMS livery.
At the same time each region was authorised to paint coaches for principal express trains in different liveries and re-introduce the naming of locomotives and trains. The former Great Western chocolate and cream quickly reappeared, while the Southern rapidly painted coaches into green, matching the EMU stock. Many newly repainted crimson and cream coaches remained in service until about 1960 before these to needed repainting.
Regional liveries also appeared in general use, as spare vehicles were utilised where needed. In 1964 BR adopted a new corporate livery of blue and grey, though the maroon and regional painted vehicles survived for many years, but slowly uniformity was enforced again.

All of these coaches are Era 5 models. This era covers the interesting transition from steam to diesel locomotives between 1957 and 1968, with a huge variety of pre-BR coaches still in service. The Western region even operated many ex-LNER Gresley design coaches as these had couplers and gangways compstible with the BR Mk1 coaches. Details of the periods covered by the era numbers can be found here.