This branch originally left the main line near Atwood, which is now part of Placentia, in Orange County. The branch had a wye at the junction, and both legs crossed Orangethorpe Drive just west of Van Buren St. The branch headed north, winding through Placentia and Yorba Linda, crossing the Pacific Electric Yorba Linda branch near what is now the intersection of Imperial Highway and Rose Drive. From there the line continued north and terminated at the community of Olinda.

Most of the branch has been abandoned for several decades. The wye junction and a short stub was still in place in the early 1980s, but those rails were removed by the mid-1980s. Today (2003) the route can be partially traced by following the street patterns in the area. The wye junction rails are gone but there are still minor berms in the ground where the tracks used to be. There are a few oil wells near the former wye and near Olinda, and a small farm is also in the area, but the rest of the route now passes through neighborhoods. In certain areas, short stretches of the right-of-way have been converted to alleys or streets.