No doubt the owners of these properties would rather it didn't, but they knew it was there when they built. You can park on Pleasant Ridge Drive without an Adventure Pass. The trip up the canyon on the railway bed would be easy, except that there are several gullies running across the bed that were formerly bridged. Today erosion and slides has made traversing some of these gullies a bit tricky. The roadway ends at the former site of the Rubio Pavilion, the staging point for the next section of the old railway.
Today there is little there but concrete ruins of foundations.
I spent about 30 minutes trying to figure how I was going to do this without killing myself. Eventually I found that a footpath continues upstream from the concrete walls about 5 feet lower than the rail bed. This path leads down to the stream a short distance up canyon. It's a short boulder hop upstream to the first waterfall, about 5' tall. This would be a tricky climb but someone has attached a heavy wire cable to the rocks above for pulling oneself up the rocks.