1931-1927-1904-1952-1940 was transferred to Westchester to replace 1921-1922-1925 which was used for the SAP seatless test and moved to Livonia for Shuttle service. Why they didn't choose 1923 instead of 1904 is beyond me. 1901-1903, 1905, 1906, 1908, 1910 and 1903 remain at Corona for now.