Doesnt mean they cant move it around the site or even what they can to somewhere else. It would be a few years before anything would happen.
Look on Google to see how much has already changed since that aerial picture was snapped. Wellington Yard + Carhouse rebuild is now at 71% completion; new tracks are online and occupied by the new cars, reducing the remaining non-storage space to only about 100,000 sq. ft. They're now redoing the loop 'infield' space to pack all the work equipment storage ever tighter, because there's a bunch of procurement items upcoming for expanded systemwide track machine and road-railer fleet acquisitions about to drop.
The outer lots along the Constitution Way property line have already been re-landscaped into a new tie-loading yard evidenced by the 20-deep stacks of ties resting up against the property fence on freshly-poured asphalt. The haphazardly arranged portable office trailers will be next to go so they can make a neatly-packed rail pile. All of the so-called 'slack' space showing in that months-old aerial is thoroughly spoken for, and being gobbled up in real time by mission-critical rail usage that can't be situated anywhere else. With all the torrid track renewal the T has scheduled on all 4 color lines over the next few years how, for example, can you work without a home-base OL tie/rail storage pile? That land is being used way faster than any outside developer can possibly daydream up a doodle and present it as a counterproposal. They aren't jump-ball parcels.
Further, all it takes is full-implementation RUR to put Orange Line to West Roxbury under paper study, as removing the Needham Line from the SW Corridor tunnel bottleneck becomes immediate urgent priority if you're full-bore planning to do 30-minute bi-directional service to Providence and Stoughton.
And if they are studying OL-West Rox, Wellington's going to have to be expanded by another 2-4 storage tracks meaning the bus training lot immediately gets targeted for eviction so the materials piles can shape-shift around the once-again expanded yard into that space. Boom...all square footage in the yard now maxed out with critical Orange-specific functions that can't plausibly be sited elsewhere.
Regardless of speculation as to the state's willingness to ultimately build OLX, the up/down decision on RUR service levels could well breach the trigger for pushing the paper study
this decade. No one has so much as enough
time to daydream about rearranging the deck chairs on the west slice of Wellington property before that trigger puts future-considerations yard expansion on the planning front-burner as a going concern. And, yes, they know right now today that's one of the potential outcomes of the Rail Vision for shaking out RUR service on a jam-packed NEC.
For all intensive purposes it was game-over for ever entertaining discussion of any non-transpo use of the property long
before the first shovel got turned on the ongoing Wellington renovations, because of the very existence of the Rail Vision and now-likelihood that RUR in some half-baked-or-better form is coming to the NEC. Whether playing or holding their chips, they can no longer afford to barter away any Wellington land functions for private use. That ship has sailed...past-tense.