I much doubt the placement of the
Route 16 bridge abutments would allow you to snake an egress around to the westbound sidewalk on the parkway, which was what
@jbray wanted to have done here. Again...even if you outright deleted the express track it's just not enough space freed up because the clearance envelope for each track is squeezed down to the minimums here.
The building is a combo substation and signal bungalow for the massive yard complex. However, since the tracks are well on their way to squeezing down for the bridge abutments by the time you reach the building it's unlikely you'd be able to structurally get anything station-related built far enough north to impact the building in the first place.