This is not close to being the world's largest electric vehicle. Early submarines were electrically powered and more than twice the size (60ft vs ~30ft), eg. the Nautilus of 1886.
https://en.wikipedia.org/wiki/Midland_Metro_rolling_stock
50-odd tonnes and I've witnessed zero to 80km/h in about 6 to 10 seconds or so.
But, yes a nice big yellow machine running on batteries is an impressive milestone.
For those in Birmingham UK: St Paul's to Jewellery Quarter is a longish bit of track just outside the city centre.