I've just heard about this, see headline from Railway Gazette International:
GERMANY: Non-stop inter-city trains linking Köln with München and Berlin in less than 4 h are to be introduced from the December 2021 timetable change, as part of an expansion of air-rail links announced by DB Fernverkehr and Lufthansa on March 8.
It would be an interesting proposition in the UK, to reduce internal flights from say London to Edinburgh/Glasgow. I wonder what city centre to city centre journey times could be achieved with non stop running?
DB to launch Lufthansa SuperSprinters
8 March 2021GERMANY: Non-stop inter-city trains linking Köln with München and Berlin in less than 4 h are to be introduced from the December 2021 timetable change, as part of an expansion of air-rail links announced by DB Fernverkehr and Lufthansa on March 8.
It would be an interesting proposition in the UK, to reduce internal flights from say London to Edinburgh/Glasgow. I wonder what city centre to city centre journey times could be achieved with non stop running?