Anyone have an idea of what type of vehicles come into the Boston Autoport? Are they destined for New England distribution or a broader market? Are they still exporting vehicles to West Africa? After digging through the archives of this and other forums I realize that any chance to capture any of this traffic dockside via rail would be a Herculean effort with clearances, and routings, etc, but is any trucked to a either Ayer or East Brookfield as a backhaul for CSX or PAS/NS? I have found vehicle counts processed through the port (upwards of 50,000 which would support rail I would think) but have not found any makes or destinations for them. Just curious.
Dunno if you've already Gearthed the Autoport's address, 100 Terminal, Charlestown, MA, or not. While I can't supply any of the details you're looking for, if you go a bit to the west, just southwest of the school bus lot, you'll see the ROW remains from more-railroad-oriented times for the port of Boston. A bit more to the west shows that the former ROW has been greenwayed. Renewing the stub back to the dock is probably a low order of probability, in part because of the repurposing of parts of the area and the operational difficulties -- vehicular traffic and occasional flooding that characterized the stub's last couple of decades.
As stated in the MassPort website, the Autoport is highway oriented. One additional element in helping keep it that way may be the very near proximity of the offices of a group with political influence, Teamsters Local 25 on Main Street, Charlestown. Local 25 is a trucking local and not directly involved with the Teamster Rail Conference.