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Sounds like a pretty niche use case, there's not many factories in the middle of cities that have a tram line running to them.
And at 15 tonne per car, 7.5 in the end cars, the payload isn't particularly impressive either.
This also didn't deliver product to the final destination, which is what most urban trucks are doing.
but something like this would get product coming-in from outside a metro area close enough to high-density population and business centers to where smaller EV delivery vehicles or postal services (they already go door-to-door each day) can do the 'last-mile'.
It really sounds like you're inventing a use case for this technology, to be honest. Most logistics centres are on the outskirts of the city, and linehaul vehicles are loaded and unloaded there, having something like that in the city centre would be a very inefficient use of space.
It also wouldn't reduce the vehicle movements inside the city by much at all.