The Bureau of Transportation of the United States Post Office Department was established in 1960. The Post Office Department is the former name of the United States Postal Service when it was a Cabinet department It was the successor to the Postal Transportation Service (PTS); the PTS had responsibility for mail transportation contracting as well as employees assigned to Mobile Unit and stationary PTS facilities such as Air Mail Facility, Terminal Railway Post Office, or Transfer Office operations. Postal Transportation Service On October 1 1949 the Post Office Department renamed the Railway Mail Service as Postal Transportation Service With the establishment of the first air-mail route in 1918 and the later additional routes plus the accepted use of premium priced air mail by the public it was only natural that the Railway Terminal railway post offices were sorting facilities which were established by the Railway Mail Service to speed the distribution of Parcel post. --Transfer Office-- Shortly before WW I Transfer Clerks were assigned at some of the larger railroad junction points Only the contract issuance and administration responsibilities for mail routes were given to the Bureau of Transportation. Human Resources were transferred to postmasters in the cities where Mobile and Stationary Units were located. This division of activity continued to the end of the Post Office Department and after it became the U.S. Postal Service.