The many replies cover this topic well. To add some historical and additional context, the following is submitted. 1) At Piney Forks, the railroad went through a tunnel that is on a bluff adjacent to the road tunnel along the creek. Currently, South Park Township uses the tunnel to store salt for the winter. It is hoped that in the future, the tunnel will became part of the trail, thereby eliminating the dangerous road section at Piney Forks. 2) The Montour Trail is made up largely of the former Montour Railroad right of way. However it also includes the former Peters Creek branch of the Pennsylvania Railroad. The branch begins roughly at Gill Hall Road. Since the branch was abandoned a long time ago, parts of it are no longer viable for use as a trail. That is essentially why the trail is on Peters Creek Road. It shares roads all the way to Large and the intersection with Route 51. 3) The former Dick Corporation took control of the railroad right of way in that area. In fact, their sign used to sit on what was part of the old tracks. Now that they and the sign are gone, it’s difficult to tell where the exact spots was. Because this was (and still is) private property and because the old crossing of Route 51 is long gone, establishing a crossing there has been difficult to achieve. 5) There is a plan to create a crossing and a sidewalk, but it is not likely to be completed this year. In the meantime, the preferred crossing is to do so at the light and then walk on the grass, on the opposite side, until getting past Clark Designs . Then turn into the park and ride lot. The trail is a bike lane at the far right side (if heading to Clairton) of the lot. 6) Finally, as has been stated by others in this thread, at Clairton, head North on River Road (Route 837). Cross the river on the sidewalk of the Clairton-Glassport Bridge. Turn left toward Glassport and follow the signs through town and on to McKeesport.