The trail is open year-round and is beautiful to visit anytime. The Trolley Trail is a rails-to-trails effort that uses the route of the Portland Traction Company's streetcar line from Milwaukie through Oak Grove to Gladstone. Lots of poison ivy, decent elevation to get your heart rate up, cool ruins of the trolly era. Ohio House, 4700 States Drive,Philadelphia,Pennsylvania19131, Tel: 215.988.9334 | Fax: 215.988.9335 | [javascript protected email address]/*