"Matthew Dickinson" wrote ...
Two interesting documents:
http://www.publications.parliament.u...tran/84/84.pdf
http://www.lafabriquedelacite.com/fabrique-de-la-cite/data.nsf/8384123E801FB916C125747A005C5D1C/$File/fabrique-4d-ticketing.pdf

Well worth reading Roger Ford's not-too-technical discussion in December's
Modern Railways; looks like it's a story that will run well into 2010, if
not the fabled 2012 Olympics
--

Andrew