Here is a neat tool (created by Benjamin Td) that allows you to quickly see how far you can travel in Europe by rail in 5 hours. The way it works is that you just hover over a train station and then the relevant isochrone will show up. Above is what that looks like for Paris' Gare de Lyon, which has one of if not the largest catchment areas from what I can tell after playing around with the tool for a few minutes. The data being used to power this map is from Deutsche Bahn. And if there's a transfer on any of the routes, the tool assumes you can make that happen within 20 minutes, which may or may not be realistic. Regardless, it's fascinating to see just how connected (or disconnected) some cities are. It's also a shameful reminder that a North American version wouldn't be nearly as impressive.
