Trains every 10 or 15 minutes – and in rural areas. And this rail service is not only sustainable and economically viable, it also runs autonomously in response to the increasing shortage of skilled workers. The Aachen Rail Shuttle (ARS) sounds like
[1312.4068] Marcel Grossmann and his contribution to the general theory of relativity arxiv.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from arxiv.org Daily Mail and Mail on Sunday newspapers.