Have you ever taken any trains in Europe? I cannot think of any route in any country where I've lived in Europe where driving would be even remotely close to taking the train, and in some cases it's faster than flying. Newcastle to London is 2h40m by train, about 5 hours of driving. Flight is 40 minutes but you're nowhere near the city centre, so once you take into account going through security plus necessary transfer times it's much longer. Brussels to Paris is an hour and a half on the train, driving is at least double that. Krakow to Warsaw is just over 2 hours, the drive is at least 3 hours and that's to the outskirts not city centre to city centre.
Portugal, unless you happen to be a lucky one travelling on the Lisbon - Porto connection line, good luck travelling faster than taking a car, or eventually a long distance bus.
Spain, outside of the lines connecting Vigo, Barcelona, Madrid, Malaga, axis.
