all high-speed trains are running on 100% renewable

Irrelevant to what I said: discounting energy source.

Trains obviously have much less rolling resistance, as you say (an advantage partly offset by their added weight). But wind resistance is the bigger factor, and trains are usually just faster.

A train travelling at 350kmh uses 40% more energy than one going at 300kmh. This is why the service speeds usually top out at 300 everywhere, Europe, japan and China.

Speed really is the decisive factor. The pyramid hints quite well at this.