Trains across Europe seem romantic to me, never mind the carbon costing. Austrian state trains (ÖBB) does it very well, especially by North American standards — in both Canada and the US, our train services are abysmal. So do the French, with their TGV (très grande vitesse) lines. Last spring, we took a TGV train from Paris to Toulouse in greater comfort, and likely door-to-door speed, than we could a regular flight. And the whole lot of us — 6 people heading for a party in the countryside — got to sit together.
Image: a local train somewhere between Thunau am Kamp and Horn in Lower Austria, October 2019.