Livermore
Helpful links:
Map on the abandoned railway line from Niles to Tracy.
eLivermore's "Livermore's History - Rails 1"
The links to the Livermore section are below.
1501, The Summit Tunnel - 1,200 feet long, Livermore Pass
1503, Looking out of the Tunnel at Livermore Pass, Alameda County -- Western Pacific Railroad.
1505, The Fill South of the Summit Tunnel, Livermore Pass, Alameda Co. -- Western Pacific Railroad.
1506, The Fill and Cut South of the Summit Tunnel, Livermore Pass -- Western Pacific Railroad.
1508. The Summit, Livermore Pass, Alameda County -- Western Pacific Railroad.
1509, The Big Cut, Livermore Pass, Alameda County. Western Pacific Railroad. Another source of photo
1510, Up the Grade, in the Big Cut, Livermore Pass, Alameda County -- Western Pacific Railroad.