Why were they ever scrapped?
They're efficient, pleasant to ride in and far cheaper than a tram network to set up or maintain. With new and improved battery technology, flexibility can be maximised and disruption mitigated.

Their hill-climbing ability is unmatched by the majority of public transit modes. Acceleration is better than diesel buses and energy from braking can be recovered.

With all the net-zero, carbon neutral initiatives, surely transit agencies should be clamouring for them?