I think we might already be in that future with electrics. Just look at most tram and subway systems in major cities, you will usually find a mix of rolling sto

I think we might already be in that future with electrics. Just look at most tram and subway systems in major cities, you will usually find a mix of rolling stock with some produced as far back as 60s or 70s and still in daily service. The equivalent ICE bus has long since been scrapped. Not necessarily by design, it's simply inherent to electric drive, you have much less "metal grinding against lubricated metal with a controlled wear rate" situations that seems to doom ICEs and the associated transmissions on the long run.