From the renderings, they would have to deck over about a half mile of tracks between W. 4th St and the south end of Widett Circle, and that presumes Cabot Yard is axed and not decked as well.
Assuming 250,000 sq ft of deck at a construction cost of $400 a sq ft., that's $100 million just to cover the tracks.
checked out widett today, ive actually, amazingly, never been in there. i have no idea how they would handle covering up those tracks. but it raises some questions about possible transit projects:
1. post olympics, reroute the SB access road to line up with the mass ave connector and open it to through traffic
2. the discussions on this board made the copley-seaport express train seem like a silly and infeasible project due to lack of means to get across the old colony mainline. would this project possibly allow a connection to be build in conjunction?
3. crazy transit pitch: light rail line or BRT along the newly rerouted access road to run in fully dedicated lanes from ruggles to seaport? not sure if this would actually accomplish anything useful, transity wise.
4. Crazy transit pitch: contruct the connection for the DMU seaport express (as above), as a bridge over the tracks, then route it right along 93, hugging it, with infill stations there for future development, before it heads to copley. would also service ink block and troy developments.