How far can you go by train in 5h?

Why some parts of Europe is missing, e.g. Greece? Source seems to have data for it. Also, it would be neat to see more countries of the world mapped out: Japan, US for a start.

I can go about

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kilometers.

I think this should be rendered in 3D on a globe so it's easy to compare the covered distances between different places.

It also shows how much the train networks focus on domestic travel.

In nearly all bigger countries it is possible to reach most bigger cities within the 5h. But journeys in this time-frame seldomly go much beyond the border. There is still much optimization potential for transnational travel in Europe's train network.

Interesting that it uses 20 minutes. I guess that's optimistic if you need to account for delays, but that's much longer than I often take to transfer (5 minutes often being workable if the trains are generally reliable, and you're able to catch a later train if you miss the intended one).