In message

, at 11:03:50 on Sun, 30 Dec 2012, Recliner
remarked:
I saw a map the other week with a distinction
between step-free from train and from platform, presumably the latter
have a step up/down from the train. In that context, is Watford Junction
step-free from the train?

It has a white background symbol, so presumably only to the platform, not
the train. Also, I assume that S Stock and 378s have different floor
heights, so even if it's step-free for one, it may not be for the other. I
wonder, how closely do the floor and platform have to match to be classed
as step-free?

Within about a half an inch (or whatever that is in new money) I expect.
There are some tube station platforms (eg at Kings Cross) which have
short ramped-up regions, which I assume is to ensure that it's level.
You don't really need more than one carriage to be available, and if
there's a station with mixed stock you would just have to use the PIS to
indicate which ramped area was the one appropriate for the next train.

ps. I'm a bit disappointed that TfL (like many others) conflate
'disabled' with 'in a wheelchair'. There are many other disabilities
which can significantly affect people's ability to use public transport,
but aren't affected by step-free-ness.

I would have no issue if they went beyond their wheelchair symbol
and actually described the relevant stations as "step free", which can
of course also be of use to passengers who have chronic back pain, but
are able to walk as long as they can also drag a wheelie-bag with them
and not encounter stairs (but a one-inch step into a train would
probably be OK).
--
Roland Perry