There is a similar app available for the London Underground at http://www.tubeexits.co.uk/ http://www.tubeexits.co.uk/ The data is pretty good (only found a si

There is a similar app available for the London Underground at http://www.tubeexits.co.uk/ http://www.tubeexits.co.uk/ The data is pretty good (only found a single sub-optimal station so far), whilst the UI is fidgety at times but I'm sure it will improve.