been built in 1936), railroads still ordered sets of equipment with the intention that those sets stay with a particular train. In 1937–1938, the Santa Fe embarked on a massive program to upgrade its passenger fleet: it introduced new sets on the Chief, Super Chief and El Capitan, and added three new trains — the Chicagoan, Kansas Cityan, and the San Diegan. On March 27, 1938, the Santa Fe inaugurated the San Diegan, operating on a schedule of hours. The single equipment set could make two round-trips per day. A second San Diegan consist entered service on June 8, 1941, doubling the schedule to four daily round trips. The San Diegan was supplemented by two conventional heavyweight trains. December 31, 1940: Engine No. 1676, a 2-10-2 type locomotive in charge of Train 135, the "Night Coast," is bound for Los Angeles with a 40-car freight when it derails just after 9:00 p.m. and goes over a bluff south of Del Mar, with 8 freight cars following suit. Nine additional cars were derailed but did not fall. Three members of the engine crew were killed in the accident, and many days passed before all of the wreckage could be retrieved; only one car actually ended up on the beach near the water. It was determined that water seepage had undermined the trackbed where the incident took place, causing the rails to spread. June 8, 1941: A second lightweight train consisting of six coaches, a baggage-mail car, a tavern lunch-counter car, and a round-end observation car is added to the line. Service is increased to four daily round trips with streamliners and one round trip using conventional equipment. October 27, 1941: A fifth, steam-powered train is added to the schedule, due in part to the need to transport military personnel to and from San Diego's bases. This semi-streamlined train carries a full buffet car, a diner, and three coaches that had all previously run as the Valley Flyer between Oakland and Bakersfield. The number of daily trains servicing the route increases to 16, on average. 1942: The average number of trains per day increases to 42. Consist size expands to 13 cars, and each logs 512 daily miles. Trains consisting of 10-12 former Southern Pacific interurban trailer cars, owned by the U.S. Maritime Commission but bearing ATSF markings, are fitted with conventional knuckle couplers at each end of the trainset and pressed