Jon Worth's [1] CrossBorderRail project [2] aims to highlight missing cross-border rail links in Europe. He's recently embarked on a huge rail and bike journey that crosses every internal border inside the European Union (and EFTA countries) that you can cross by train. En route he's stopping off to organise a meeting in the political capital of each country to discuss the missing rail links with local activists.

[1]: https://twitter.com/jonworth [2]: https://crossborderrail.trainsforeurope.eu/