Great that it stores the entire timetable in only 6MB(?) of storage.
Some feedback: I don't think it can route through London as it isn't aware of tube connections between stations? And the classic stress test of Penzance to Thurso is too long for the routing algorithm, but I imagine that's beyond scope?
Pricing would make this a super useful tool!
Thanks for the feedback. I was missing the "Fixed Links" data, which covers any transfers that aren't part of the normal rail network (e.g. walking/bus/tube). I've just added that, so the tube routes via London should work for you now.
The routeing data is pretty complex - there are layers on layers of data files and rules to cover all the edge cases and weird stations/routes. It's been really fun to dig into it.
I'll look into adding more possible connections to see if it can find the Penzance route - I'd be curious to know if anyone has ever actually completed the 27 hour journey!