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Or 40km between swapping battery packs.

https://en.wikipedia.org/wiki/Charging_station#Battery_swapp...

100km with the updated batteries they are planning apparently. I imagine, you could stuff quite a bit more battery in a train at the cost of passenger space.

And you could add overhead pantographs or third rails at key stations to charge the battery whilst it is stopped, and for a mile or so after if it is deemed necessary.

A battery means that you don't need to build miles of infrastructure. You can just add a small amount.

Until you show up to the next station and its charging infrastructure is broken.

A train traveling more than 100km in a single trip is extremely common. 1000km, the range of the current hydrogen prototypes, is much more feasible.

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