In 1923, 18 of the “Palace” cars, 600-617, were rebuilt with equipment for hauling a trailer for rush hour service on the Canal Street lines.  This poorly-focused photo shows car 616 hauling an unidentified trailer on the Canal Belt line, inbound on Canal Street at about Baronne Street.  Note the early traffic signal, one of several erected in the middle of the now-unused center track.  The photo was taken between 1923 and 1929.