The plant hasn't shipped by rail in many years (AFAIK). If you look at Cumberland St. on Google Street View, the crossing is paved over, with the signals in place.
But then...if you just look at the aerial, you'll see coal hoppers in storage all the way to the end.
Question...what is the condition of the old belt line? Was it made dormant, then refurbished for storage? Or am I backwards on this?