I don't understand what a "HarborTram" is - it's a dedicated bus line or something like the tram at Universal Studios? It runs on rubber wheels? How fast can it go? What other cities have these?
I am seriously thinking that we need a monorail from South Station to North Station. The idea would be for people traveling through the city; yes, it would be in place of a North-South rail link. Sorry.
Going along the route of the Greenway, it would have one rail going North and take up one lane of what is now northbound car traffic. Likewise, going South. It would be high enough that traffic could continue below, in theory.
There would be two stops on the way: one at the Chiofaro building / Aquarium. It would be built so that it could be connected as a sort of intermodal station, connecting to the Blue Line below and directly connected to the new Chiofaro building by a covered walkway.
Further up the street, it would cross the Greenway before it gets to the North End pavilions and run parallel to the Southbound train. It would stop near Haymarket station or near Faneuil Hall. Perhaps it could become part of the ex-Raymond Government Center garage project. Then, it would decline in height on the way to North Station, along the side of Beverly or the other street, built so as to allow new buildings on those parcels. It would meet up with the North Station Orange and Green line station with direct access to the train depot.
Why not?