Even longtime residents may puzzle over the seemingly meaningless jumble of letters that designate Muni’s light rail lines. What kind of alphabet is J,K,L,M, and N? (Or, as the department refers to them internally, Jay, Kilo, Lima, Mary, and Nancy.)

Here’s Muni Diaries and local architect Randolph Ruiz to the rescue. As you can see from Ruiz's map of a San Fr... read more...