Here are some links to the Sacramento Streetcar Project, which appears to have gained momentum this month.
Downtown/Riverfront Streetcar Project Website
Feds Give Sacramento Streetcar A Green Light (May 6, 2014)
Sacramento Streetcar Projects Gets Boost From Arena Developers
Cities Pursuing Streetcars As Economic Driver
Visualization of Downtown Sacramento Streetcar Near Riverfront
Photo: Portland Streetcar at Broadway Bridge (similar to the Tower Bridge: close but no cigar…)