From the parking lot, you'll use the Orange Trail
to access this trail. Once you get there, the trail is well-marked with green blazes.
The highlight of the Green Train is a waterfall on a tributary creek to the Etowah River at the one-mile mark where the trail approaches the Etowah River.
The clockwise descent from the orange trail down to the river is probably the narrowest singletrack in Dawson Forest. There are several switchbacks on the way down to contend with and overall it's another fun, short descent in this trail system.
There is one creek crossing in the singletrack segment; two if you do visit the waterfall.
Take a moment to enjoy the waterfall because the next mile is a dirt road that you climb back to the Orange Trail