The Jacobsen Track provided access from Ingham to the mining town of Ewan. It passed near Mount Jacobson to Hidden Valley and was the earliest of the Mt Spec tracks and the one most used. Today, the Jacobsen Track is a forestry road and connects Valley Rd to Pappins Rd; there is private property at either end.
Unfortunately, the Jacobsen Track is no longer maintained and is no longer drivable by car or motorbike. Fallen trees now lay across the track making it impassable for a vehicle without a chainsaw. Lawyer Cane, Lantana and other vegetation has spread across the track in many sections making parts of the track slow to walk along.
National Parks want to maintain this track as a fire fighting trail and the big problem is that it comes out on private property at both ends.
You'll need to contact land owner to request permission to pass through their private property on either end.