I'm very much rooting for this. A lot of train tracks are not electrified simply because it is not economical to do so. I know that most of Denmark(outside of greater Copenhagen, and Aarhus) is still operating Diesel trains. Such battery backed "electric" trains may be just the thing to turn those Diesel trains into cleaner ones without needing a huge capital investment of electrifying vast track networks that are not used justifiably as much.