I think an easy win for tram/tramtrain systems would be to have capacity to move cargo, either in rollcages like grocery shops use, or on pallets with dollies from a peripheral location, to city center locations and eliminate at least some light goods vehicles. The problem is, it would probably be a very inefficient use of labour to have humans do all the last few hundred yards pushing.
This reminds me of a pet idea of mine, to write an interactive fiction / text-based dungeon crawler based around trying to navigate underground tunnels and interacting with various weird computers throughout them to progress (take the TTY from the seismometer and use it to access the ventilation control computer, find the datatape of the plans for level IX to then find the hydraulic controls for the main blast door ect.)