Here's a fascinating silent film rescued and preserved by Archive.org (a great site, go check it out!) showing Los Angeles in the late 1940s. We asked Ralph Cantos, LA traction expert, to give us his thoughts on it; here's what he wrote:
I would put the year of this film as late 1947 / early 1948. The film starts looking east above the 2nd Street tunnel . At time stamp 3:36, camera car turns onto 5th St. and heads west. Notice LA Motor Coach TD-4502 and abandoned LATL 3 line car tracks, 5th St now one way west bound. Camera passes Central Library with Trolley Coach overhead visible. At time stamp 4:33, PE buses can be seen on the right, could be the Olive St Bus Deck at the Subway Terminal. At time stamp 4:44, camera car turns on to 1st Street, Overhead wire protector can be seen spanning the street, and "track crack" visible.