happypig
Staring at the rude boys
Being able to have tickets sent to a mobile (as airlines and National Express do) wouldn't be rarely used, it's something that would be really, really useful. And I imagine a system that allows railway staff to talk to other railway staff without going through publicly available numbers would also be pretty useful.
British rail used to have their own national telephone network, the Brighton exchange was in the depot in New England Road. Last time I went there was in the late 80's though and I'm not sure they still operate it.