Newscopy: "MARKET ST. MORNING SCENE--No, sir, this is not a picture of a big streetcar tie-up, but just a regular morning scene downtown. With track repair work in progress on lower Market-st, Municipal Railway officials explained, there is a 9 a. m. 'switchback,' when the inner tracks below First-st which are being replace are taken out of service until the evening rush hour. This will be going on every day for several months--and the Muni managers wish people would stop calling up and demanding, 'What's the big tie-up all about?".