"The very last SIRT special was for Queen Elizabeth II and Prince Philip of England on October 21, 1957. They traveled by rail from a state meeting with President Eisenhower in Washington DC to New York and a ride on the Staten Island Ferry. Their trains (press and royal) left Washington the evening of October 20 for Camp Kilmer New Jersey, traveling over the B&O and Reading Company. The movement was similar to a POTUS (President of the US) with extremely high security and secrecy.
Both trains reached the Camp via Reading’s Port Reading Branch. At the Camp, the trains were reconfigured by dropping the two leading diesel units of each, leaving one unit each for the next part of the trip to Staten Island. This was done for passing over the Arthur Kill swing bridge which had a limited load capacity. The two lead diesel sets were then taken to Cranford Junction via the Reading and Jersey Central to await return of the equipment from Staten Island.
On Monday, October 21 at 6 AM, the 10 car press train left Camp Kilmer over the Lehigh Valley to Staten Island Junction and the SIRT. Exactly one hour later, the 11 car heavy-weight Pullman-equipped royal train followed. Both specials rolled directly and non-stop into a freight yard at Stapleton. It was specially cleaned up for the occasion as was the motorcade’s route along Bay Street to St. George Ferry Terminal. As soon as the Queen’s motorcade left the yard, an SIRT switcher took each train back to Cranford Junction, hauling them in reverse. From Cranford, the equipment of both trains dead-headed to Baltimore early that afternoon."
Source:
http://jcrhs.org/B&O.html