You were right to say that travelling by train is the most eco-friendly way of travelling. The following numbers prove that.
The CO2 emissions per passenger per kilometre (abbreviated as pkm) of the different means of transport […] are:
Buses and Coaches: 68g/pkm
Medium ferries (5000 to 30000 gross tons): 86g/pkm
Small ferries (less than 5000 gross tons): 258g/pkm
(http://www.move2learn-register.eu , from 11.12.2017).
So, for our planet it was a good decision!!!
Ibtisam und Franziska