1 - SRS 125 was shipped to Europe in 1961 to conduct rail testing there. It returned to the United States on board the S.S. Le Moyne D'Iberville, being unloaded in New York on May 14, 1963. This number was used as a production number for a Brill Car that was delivered to Sperry. 4 - SRS 402 and 403 were converted from Mack FCD Type ll railbuses. In 1969, Sperry purchased X8015 from the Penn Central.
Plans are to restore the car as a doodlebug.