into service to handle the additional passenger loads. April 1943: The schedule is lengthened to three hours due to ever-increasing military movements. May 10, 1943: Santa Fe adds a second mainline track along the San Diego line between La Mirada and Fullerton to accommodate increased wartime traffic. Centralized Traffic Control (CTC) is installed on the line. May 21, 1952: The Santa Fe places two Budd Rail Diesel Cars, DC191 and DC192, into service. The two cars, coupled together, make two daily round trips. One of these is a non-stop express service timed at 2 hours 15 minutes. August 25, 1953: Santa Fe 3751 pulls the last steam-powered trains (Nos. 72 and 73) on the "Surf Line." January 10, 1954: The use of round-end observation cars is discontinued in order to eliminate the need to "turn" the trains in San Diego before heading northward. January 22, 1956: Redondo Junction train wreck. Bound for San Diego, the two RDCs (making up train No. 82) derail at 69 mph in an evening high-speed accident at Redondo Junction, California, just south of the Los Angeles Union Passenger Terminal (LAUPT), killing 30 and seriously injuring 117. This accident ended the units' run on the "Surf Line." The radio reports of the accident were one of the first major uses of the Sigalert (known at the time as a "Sigmon Traffic Alert"). March 1956: General Motors' Aerotrain makes a series of experimental runs as a San Diegan consist. Thoughts of placing it in permanent service are quickly abandoned as the entire train set has to be turned at each end of the line, and requires helper locomotives on the Sorrento Grade. April 28, 1956: Heavyweight local trains Nos. 70 and 75 are discontinued due to losses. Summer 1956: Santa Fe's El Capitan makes three demonstration runs to San Diego to promote its new "Hi-Level" cars. The railroad begins placing illuminated drumheads (formerly mounted on round-end observation cars) on the vestibule gate of the trailing cars of the San Diegan. Service on the line is reduced to six daily round trips. Summer 1958: Service is further reduced to five daily round trips and weekend extra trains. November 19, 1958: An F4D Skyray fighter jet overshoots the runway at Marine Corps Air Station El Toro and is struck by southbound train No. 74 at -per-hour. All three locomotive units and cars #3430, #3165, #3144, #1399, #3100, #3094, #3082