On 6 May, 01:50, Charles Ellson wrote:

London Transport used to issue a "proper" railway map (Underground
lines in usual colours, all BR lines black, main roads shown) the same
size as the bus map until the 1970s but it tended to be of variable
availability from other than the few information booths/offices.

I think you are referring to the "London's Transport Systems" map,
which really was excellent. I think it was first issued in the 1960s,
and lasted into the mid-70s.

It was available in the same format as the bus maps of that era, and
was also displayed in the same size as the Underground map.

For some reason it seems quite rare - I haven't seen one in years, and
never on-line (which is a great pity).