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this kind of information should be available all around the world. Love that the tube has an API for that

Good luck getting access to it though (especially the National Rail one), I tried and failed.

The TFL tube and bus data is effectively open now. I think I actually applied, but the URLs don't need any authentication and http://www.tfl.gov.uk/businessandpartners/syndication/16493.... gives you everything you need to query it.

I know that National Rail is a lot more awkward though.

I came across the same hindrances when trying to build something similar to this. Public transportation data is surprisingly private.