In its heyday, the facility not only handled Santa Fe traffic but also that of the San Diego and Arizona Railway (SD&A) and San Diego Electric Railway (SDERy). The designation was officially changed to "San Diego Union Station" in response to the SD&A's completion of its own transcontinental line in December 1919. The Santa Fe resumed solo operation of the station in January 1951 when the San Diego and Arizona Eastern Railway (successor to the SD&A) discontinued passenger service, the SDERy having ceased operation some two years prior.