The project - potentially the biggest in the borough - calls for a new sports arena for the New Jersey Nets, apartment buildings, and open space on a vast tract of railyard land that has been unused for years. Plans for the site have been downsized significantly in the past few years in response to organized opposition from some elected officials, residents, and some community groups...
No, it's not on the railyard only.
No, the railyard is not "unused;" it's still a railyard, but until recently a platform for above-ground development hasn't been fiscally feasible.
And, no, the downsizing hasn't been significant.