During the 1990s, the London Underground experimented with exterior liveries to combat graffiti that had entirely covered their aluminium trains. I believe it was also to promote their corporate colours, and as a response to new health and safety standards, such as full red fronts and no wooden interiors.
Three types of liveries were experimented on the 1959, 1972, C and A stocks:
- Red front, blue doors, white body
- Red front, blue upper half of body, white lower half of body
- Red front, red doors, blue skirts, white body.
The latter was chosen as the current London Underground livery.
I believe the 1972TS units were 3202/3523 (red doors), 3204/3522 (upper blue body) and 3227/3518 (blue doors). The 1959TS units were only done in the current livery, but I can't remember which. Suffice to say, most of the units weren't run as a whole, so they usually ran with other unpainted units.