As far as I can tell from aerial photos, the only remaining tracks that would be able to be connected back to a main line would be the spurs that came off the Gardner Branch just north of the Barbers Junction switch (one on each side). Anything else would either be blocked by newer buildings along the Worcester Main or would be at too low an elevation to connect to the Gardner Branch. As far as whose customer it would be, it depends on if its considered a new customer (in which case it would be P&W) or a previously existing one (in which case it would be B&M/CSX).