I'd have to look at R.D. Karr's book on the Railroads of Northern New England, but I believe that in providing the history of this line he said that in its last 19 years of the branch's existence, the B&M hauled exactly 19 boxcars of freight on it. The B&M was saddled with it when it took over the Fitchburg, and neither wanted nor needed it, but whenever abandonment was talked about, there were some local shippers who protested. It died a long, protracted death.
I used to think the ROW was hard to find, but the latest USGS topo maps of the area reveal that there is actually quite a bit of the line that can be traced. However, the northern end, into Goffstown, kind of disappears into the 'burbs. I have no idea where it once lay as it approached Manchester. Old topo maps aren't of any help.