They should be repainted every five years in traditional black and white livery.
Vehicles were painted in a white livery with a red skirt.
They are all coloured in white, blue and black livery.
Both units were painted in a blue and white livery.
The Zenith currently still has the red & white livery.
Little change was noticeable at first, the corporate green and white livery not appearing until the early 1970s.
During the early days a mainly creamy white livery was used.
This was replaced in 2012 by a white with dark blue and yellow flashes livery.
From 1994 to 1997, the cars ran in a blue and white livery.
As part of the franchise change they introduced a new blue, white and green livery.