The history of British Rail's corporate liveries is quite complex. Although from the mid-1960s to the 1980s the organisation was associated with "Rail Blue", a number of other schemes were also used, especially when it was split into operating units or "sectors" in the mid-1980s. Corridor coaching stock was originally trialled in carmine and white (nicknamed Plum and Spilt Milk) before Crimson Lake and Cream livery (nicknamed Blood and Custard) was adopted across the network; non-corridor stock was painted plain Crimson Lake.