These 4 PS Fluted Side Prewar Diner Lounge Observations were delivered to Rock Island in late '40 for use in the "Choctaw Rocket" and "Zephyr Rocket."  When originally put in service, the 16 lounge seats were sold as first class seating.  The cars were named and numbered:  430 "Memphis," 431 "Little Rock," 432 "St. Louis," 433 "St. Paul."  In '58, 431 was converted to a mid-train 30 seat diner.  The remaining 3 were retired in '60 and '61 and either sold to an equipment dealer or dismantled.  431 was retired in '74 and sold to a company in Cleveland.