I'm curious where Rock of Ages would be served from...
At least as of August 2014 it doesn't look like the upper switchback beyond Websterville Road has been used in quite some time...
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Though I do note the presence of "Warning Active Railroad - expect increased rail traffic effective [date - maybe June 1, 2007?]" signs below the crossbucks. That's as close as you can get on streetview, and the right-of-way is barely distinguishable as a line in the woods beyond there.
However, on the lower switchback (inbound from Northern Power Systems) the tracks even look freshly ballasted, and in not-too-terrible shape (e.g. Quarry Hill Rd crossing) (though there is a tree down across the tracks at Quarry St).
There's a stone train parked along Metro Way in "downtown" Barre in aerial imagery, so I know stone must move from somewhere. Is the track still in service and used all the way to the quarry, despite appearances, or do they transload from somewhere?