RMS:- Railway Mail Service
RMS stands for Railway Mail Service. It was the United States Postal Service’s and was a significant mail transportation service in the country. RMS was prominent from the mid-19th century to the mid-20th century. It was succeeded by the Postal Transportation Service (PTS) that carried a large number of letters and packages mailed in the United States. This was from the 1890s to the 1960s. The founder is said to be George B. Armstrong. He was the manager of the Chicago Post Office. He is also said to have founded the concept of en route mail sorting aboard trains. Before this concept was introduced, emails had been carried in locked pouches through a board trains. However, there had not been an organized system of sorting mail en route, to have mail prepared for delivery when these mail pouches reached their destination. To fulfill the request of Armstrong, the first railway post office (RPO) started operating on the Chicago and North Western Railway between Chicago and Clinton, Iowa. This was on the date 28th August 1864. The concept succeeded pretty well and quickly expanded to other railroads out of Chicago. It was officially inaugurated in 1869.