This line connected to the Nimbus to Folsom with a wye at Folsom Junction in Natoma, a few miles west of Folsom. The line had a windy route through the foothills to the town of Placerville. The eastern end of the branch connected with the shortline Camino Placerville & Lake Tahoe, which extended east from Placerville to Camino.
The line was used to haul forest products, and was in service until approximately the 1980s. Much of the western line is still intact, though it is no longer connected to the national rail network. Part of the line is used by private owners foir operating their "speeders" (retired railroad inspection vehicles).
While not technically and officially "abandoned", the current route is under the ownership of the Placerville and Sacramento Valley Railroad, who is in the process of restoring the line on which to run excursions using equipment from the California State Railroad Museum. More information can be found at the link below.
Thanks to Mike Palmer for contributing information about this route.