Title shared on HN left me somewhat disappointed. The actual time appears to be "Where can you go by train in 8h?", though that's somewhat less clear. It only seems to include central stations of larger cities, though I was hoping for a list of shortest travel times between stations in Europe, as more of a thought/data experiment. Or put another way; which two train stations in Europe have the least distance between…
That would not be very interesting. I live close to a train station that's less than 5 minutes (by train) away from the nearest other train station. The other train station is the city hub with many connections to other cities. There is nothing interesting about this connection, it simply replaces a 20 minute bike or bus ride. There are many such connections.