Proposed Layout of Piers 48, 50 and 52
The 1922-1924 Biennial Report published this map showing the proposed track alignments for the Pier 48-50 area, south of China Basin. Note the existing yards and car ferry slip. Also note the wye at Pier 46.
This map is available as an overlay for Google Earth [196KB KMZ]. If you haven't tried Google Earth, it's worth your while to download it (it's free) and look at track alignments for your favorite railroad. Download Google Earth here.