鉄道郵便局
The Railway Mail Service organization within the Post Office Department existed between 1864 and September 30, 1948. It was renamed the Postal Transportation Service on October 1, 1948, and existed until 1960. After 1960, the management of railway post office routes as well as Highway Post Office routes, Air Mail Facility, Terminal Railway Post Office, and Transfer Office, were shifted to the Bureau of Transportation.