Not to be confused with the Oregon Electric branch line to Forest Grove that was built later.
This was a line that planned to head up and over the hills behind northwest Portland and down the other side to Hillsboro and thence on to Forest Grove. First proposed by the West Side & Suburban Company in 1901, the rights passed on to the Oregon Traction Company in 1903 with nothing constructed. This second company did manage to build about a mile of line within the Portland city limits, but they eventually went out of business and all the rights and track were purchased by the United Railways company. This third company rebuilt the Oregon Traction Company track on Twelfth and Stark streets with better rail and eventually integrated it into its later interurban line out to Linnton and Wilkesboro. A September 1907 Oregon Daily Journal article claims that track was laid from NW Cornell and Pettygrove, down Pettygrove to Twelfth, and then south on Twelfth to SW Stark Street, though work on extending the line up the hills west of Portland never seems to have happened, as the United Railways turned their attention to the Wilkesboro line instead.
The franchise is shown as a dashed line on a 1911 map of rail in Portland, long after the plans for its construction had been abandoned.