In message , at
11:22:24 on Fri, 22 May 2015, Offramp remarked:
Tuffers was one of those stations that had a rather annoying lift/escalator characteristic.

The former is usually because there needs to be a mini concourse which
has access to both platforms, and it can't be any lower because the
tracks are in the way. I'll speculate that the latter is so that the
lift's machinery room can be at ground level.

Aye. That does make sense. But at stations such as the Claphams North & Common,
at the bottom, platform end there is only one platform at the end of the escalator,
and a flight of stairs to reach them.

Even with an island platform, the tracks would have to diverge in order
to fit around the bottom of escalators, and diverge enormously to get
past lift shafts and their circulating areas.

Were any of the island-platform stations originally built with
escalators? Angel had lifts, and the entrance was moved round the corner
during the rebuild to accommodate the horizontal reach of the new
escalators.
--
Roland Perry