Could be Toyota.

https://cleantechnica.com/2021/04/09/toyota-applies-diesel-killing-hydrogen-fuel-cell-muscle-to-eu-railways/

At the heart of the [FCH2RAIL] project there is a hybrid, bi-modal drive system that combines the electrical power supply from the overhead line with a ‘fuel cell hybrid power pack’ (consisting of hydrogen fuel cells and batteries) that works independent of the overhead line,” explains Toyota.