Historical version 2 of Category Step-Free Access (view current version)
Places or things that can be got into without having to use steps.
In the case of the Tube, when there is no [Fire Brigade]? cover, London Underground will not operate stations where the only access to the platforms is by lift. Note: access does not include emergency stairs.
Here is the official LT map: http://thetube.com/content/pressreleases/0210/firestrike.htm