Firstly, I believe the trains are EMUs, so every bogey is powered rather than having the whole thing hailed by an engine; this is actually a huge benefit of electric as the trains can accelerate to speed much faster when they’re all wheel drive.
But to address your main point, the rolling resistance of a train in motion is tiny; basically all the energy cost is at acceleration time— it probably cruises at like 5-10% power.
But to address your main point, the rolling resistance of a train in motion is tiny; basically all the energy cost is at acceleration time— it probably cruises at like 5-10% power.