@Hypx It's pretty nice to buy a smaller battery and top up halfway.
The diesel routes already have some bits with electrical overhead wires.
They sometimes share the track with an electrical train. In the depot and perhaps on some stations along the way. The article mentions it as a reason for choosing battery over hydrogen. Because the electrical connection exist it's relatively easy to extend it enough to top up.
I also think there may be a lack of green hydrogen. Need renewable fuel 🤷