The Crimson is not the place to get this information;
The Boston Globe is. The difference is that many urbanists, like yourself and including Mayor Wu, don't have any experience understanding the actual needs of rail transit. When they made this plan, that was also true of the MBTA. Phil Eng, who absolutely does understand it, has come in and put the kibosh on using Widett, which was the desired replacement for East-West layover needs, because the MBTA needs it for its current operations and also to implement Regional Rail (which is necessary for Boston). Now that someone who knows how to actually manage the T has stepped in, Amtrak has made it again clear that they also still need layover space for East-West Rail which is a service the State of Massachusetts is pushing for and funding, NOT Amtrak. If we want both East-West Rail and Regional Rail, we need yard space IN BOSTON as made clear by the parties with expertise in the matter. And, for the record, this will be true for ANY rail expansion in Boston. It's kind of at the point where we need to lock some of that abandoned industrial space down now if we want to have functional rail in Everett, Chelsea, and wherever because new lines will require a certain amount of centrally located yard space to function correctly. In order for Boston to thrive, it needs transit expansion; so this is a guaranteed need down the road despite how useful that land may be for other urban uses.
Why, do you think the Hudson yards project exists? That space is exponentially more desirable than anything in Boston for the next 100 years at least, and yet they still had to pay to deck over it because New York needs that space for it's network.