National Rail

Ok so this app is a little pricey at £4.99 but the author has to pay to use the datafeed from National Rail. It's definately worth it if you commute or use the train a bit, but less so if you are just a casual rail user. I certainly wish I had this when I commuted, then again the carriages I travelled in were the same slam doors as the Hogworts express (and this was only a few years ago!!)

You can plan a journey or check on live departures and journey progress, it seems to do this all very well.