Railroad-building expert Earl Vilmer created the track layout and operations for the DRR. Roger Broggie hired Vilmer because of his experience building railroads in Iran for the Allies during World War II, in France after the war, and later in Venezuela for U.S. Steel. Vilmer designed the operations of the DRR in such a way that each of its two trains would be assigned to a single station on the rail line, making only complete round trips possible. The "Retlaw 1" passenger train pulled by the No. 2 locomotive only serviced Main Street, U.S.A. Station while the "Retlaw 2" freight train pulled by the No. 1 locomotive only serviced Frontierland Station, and with sidings at both stations, each train would operate simultaneously and continue down the rail line even if the other train was stopped at its station. The first test run of the DRR's trains along the full length of its route occurred on July 10, 1955, one week before Disneyland's opening. The steam trains of the DRR were the first of Disneyland's attractions to become operational.