Before yesterday's opening of the north and south extensions of the Pennypack Trail in Montgomery County it was very difficult to get to or from the trail via SEPTA. The only trailhead was almost in the dead center of the trail on the narrow and twisty Moredon Rd in Lorimer Park. It wasn't impossible, you could get could get close via the 24 or 88 bus but the on road distance and difficulty to get to the faster and more direct regional rail trains didn't make the trip worthwhile.
The new section up to Welsh Road is now linked to the Bethayres Station on the West Trenton Line via a sidewalk that begins at the bridge over Pennypack Creek. Biking on Huntingdon Pike and Welsh Road requires a tolerance for riding in fast traffic without shoulders.
From the Bethayres station:
The new bridge at the south end of the trail crosses a deep ravine and Shady Lane and eases the trip from Fox Chase Station on the Fox Chase Line. The on road bike route from Fox Chase is less stressful than from Bethayres but there are also sidewalks for pedestrians.
From the Fox Chase station: