This is a short steep hike that's great if you don't have a lot of time. We parked on the back side of the peak, and climbed up the old rail grade. It was steeper than expected, but also very short, so we ran down the other side (main trail), and climbed back up again to complete the loop back down to the car.
If you can only do one... I definitely recommend the main trail only. It's much nicer, and it's more of a normal woods trail.