The Trolley Trail is short, a mere 3 miles but it is my favorite for fall foliage. Located in Clarks Summit, PA there are plans in the works to extend it another 10+ miles. For more information check in with Countryside Conservancy. My most recent visit was October, 2017.
In August, 2017 the trail added 1.7 additional miles near Keystone College. Unfortunately, this creates a 3 mile gap between the trail sections. Hopefully this gap will be eliminated in the near future.
You can see a video of my ride on my YouTube channel: https://youtu.be/Huv2V6mTFys