The Bellows Pipe Trail to the summit of Mt Greylock is located on Gould Rd in Adams, Massachusetts. This is a very popular trail even on a cold, wet, foggy, October day. The trail itself is fairly wide, with areas of loose rock, mud and some slight 'bouldering'. The trail is weaves up the mountain crossing the Thunderbolt Trail at several points and provides a steady moderate incline with spurts of steepness.
The pictures on the trail maps are not the clearest in my opinion, though the trail is well marked at all turns.
Near the summit is the most difficult portion of the trail. It consists of a few steep long switchbacks, after which the trail merges with the AT and continues in some short steep bursts to the summit.
Waterfall: Around mile 0.8 there's a waterfall off the trail. Views of the waterfall are better when there are no leaves on the trees.