Milan tram No. 1807 rear-ended ‘Pacific Electric’ PCC No. 1061 today headed northbound on The Embarcadero right-of-way at Washington Street (just north of the Ferry Building). The Chronicle reports that fourteen people were injured. The Chronicle story is here.
There are Muni rules about one rail vehicle following too close to another. At this writing, it is not clear what happened. What is clear, if you look at the reader comments attached to the Chronicle article, many people have already formed opinions.