In the 1880s the California and Nevada Railroad and its predecessor, the California and Mount Diablo Railroad, proposed to run a narrow gauge railroad over Sonora Pass with a line running from Emeryville - Stockton and then connecting with the Denver and Rio Grande Railroad in Utah.
In the 1880s, both the California and Nevada Railroad and its predecessor planned to construct a narrow gauge railroad over Sonora Pass, linking Emeryville to Stockton and then connecting with the Denver and Rio Grande Railroad in Utah.