Okay, now it looks like we're back to trolleys after spending so much time on cable cars the past two episodes. I think. I hope? Anyway... Before San Francisco had its single transit system in the form of the Municipal Railway, or MUNI, there were two companies that ruled the roost and made famous the "Roar of the Four" down Market Street. This other company was the Market Street Railway (MSR), which for a time was also known as the much-maligned United Railroads of San Francisco (URR). Under both names, the company experienced earthquakes, deadly labor strikes, and city franchise disputes across their 87-year history before finally folding to the might of the MUNI. On today's Trolley Tuesday, let's take A Trip Down Market Street as we look at the wide and varied history of the Market Street Railway.