Seems like they're doing work at Union this weekend:
These shutdowns don't seem to involve work at Union. The new platform is currently closed again, and the old platform is the only one in use right now. Didn't hear or see any construction while I was there earlier.
They have added some real beef columns with beam on top of them to support the roof on the south side of the old platform. They have added some concrete walls along the old south edge and could be for wider stairs or relocation of the existing ones.