When the Donner Route was double-tracked in 1911-1915, the new uphill track diverged from the older track at several locations between Rocklin and Colfax.  A few miles west of Applegate, the new track passed under the older track at a viaduct known as Tunnel 26.

The new uphill track entered Tunnel 27 seen in the distance.  Just beyond Tunnel 27 was the East Applegate station.  There was also a West Applegate station on the old downhill line to the left.  The east portal of Tunnel 27 suffered a partial collapse when the tunnel height was being increased, resulting in two east portals.