There would need to be a lot of rebuilding done to accomodate passenger traffic, but the potential is there. Merck in particular sits between the Stony Creek and the existing Pennbrook stop on the R5 and could draw employees commuting from Quakertown or Norristown. When Tropical Storm Allison washed out the R5 bridge in Fort Washington a few years ago, SEPTA used the branch as an "escape route" to bring equipment from the north end of the line down to Wayne Junction for servicing. The Silverliners were towed over the Stony Creek branch at 10mph. While the bridge was being rebuilt, R5 service operated Doylestown to Ambler only, then utilized the crossovers in Ambler to make the return trip on the outbound track. Passengers continuing to Center City were bussed to Jenkintown to connect with the R1, R2, or R3, and there was local bus service to Fort Washington, Oreland, North Hills and Glenside. I believe the reason this branch did not suffer the fate of the Plymouth Branch and disappear was that it was a national defense priority to have a backup route for trains to reach Bethlehem Steel in case the East Penn were to be disrupted.