Depending which trail you take you can actually reach the Backside of Killington Mtn. You can also reach Shrewsbury/Cuttingsville via these trails. This is mostly Doubletrack with lots of technical ascents as well as very technical descents that can switch from doubletrack to singletrack just around the next bend. This is a trail network that has several entry and exit points throughout its entirity.
From Rutland take Killington Ave east until you reach Townline Rd in Mendon, turn right onto Knotch Rd. Head south on Knotch Rd, continue south uphill a long a very windy road. Continue south over a small bridge and up another hill until you reach a wide open area that branches off in three directions. Take the immediate trailhead to your left. This is the start of this technical trail network.
http://www.singletracks.com/item.php?c=1&i=2905