is distinguished from the 1862 operation because mail was sorted to and received from each post office along the route, as well as major post offices beyond the route's end-points. George B. Armstrong, assistant postmaster at Chicago, originally came up with the idea of having mail processed and distributed while the mail was on board, en route in mail cars. With the assistance of Schuyler Colfax, Speaker of the House at the time, and A. N. Zevely, Third Assistant Postmaster General, he was duly authorized to test his ideas. In 1869, the Railway Mail Service (RMS), headed by George B. Armstrong, was officially inaugurated to handle the transportation and sorting of mail aboard trains. Armstrong was promoted from a supervisory position in the Chicago post office following his experiments in 1864 with a converted route agent's car on runs between Chicago and Clinton, Iowa. RPO car interiors, which at first consisted of solid wood furniture and fixtures, would also soon be redesigned. In 1879, an RMS employee named Charles R. Harrison developed a new set of fixtures that soon gained widespread use. Harrison's design consisted of hinged, cast-iron fixtures that could be unfolded and set up in a number of configurations to hold mail pouches, racks and a sorting table as needed for specific routes. The fixtures were also designed so they could be folded away completely to provide a wholly open space to carry general baggage and express shipments as needed by the railroads. Harrison followed through with manufacturing his design at a factory he opened in Fond du Lac, Wisconsin in 1881. The July 1, 1862, Pacific Railroad Act signed by President Lincoln established government funding for the construction of a railroad from the Missouri River to the Pacific Ocean with the express idea of opening a main line mail route across the western frontier. The act was officially entitled "AN ACT to aid in the construction of a railroad and telegraph line from the Missouri river to the Pacific Ocean, and to secure to the government the use of the same for postal, military, and other purposes". The Act opened the door to government funded railroad mail routes across the American continent. By the 1880s, railway post office routes were operating on the vast majority of passenger trains in the United States. A complex network of interconnected routes allowed mail to be transported and delivered in a