First hydrogen locomotive started working in Poland.
There is probably a use for train with battery on partially electrified lines.
The train charge on the electrified part and use batteries on the rest.
https://www.mobility.siemens.com/global/en/portfolio/rail/rolling-stock/commuter-and-regional-trains/alternative-drives.html
It's definitely a thing already.
This is a most excellent place for technology news and articles.
There is probably a use for train with battery on partially electrified lines.
The train charge on the electrified part and use batteries on the rest.
https://www.mobility.siemens.com/global/en/portfolio/rail/rolling-stock/commuter-and-regional-trains/alternative-drives.html
It's definitely a thing already.