Railway post office

In the United States, a railway post office, commonly abbreviated as RPO, was a railroad car that was normally operated in passenger service as a means to sort mail en route, in order to speed delivery. The RPO was staffed by highly trained Railway Mail Service postal clerks, and was off-limits to the passengers on the train. In the UK and Ireland, the equivalent term was Travelling Post Office (TPO).

From the middle of the 19th century, many American railroads earned substantial revenues through contracts with the U.S. Post Office Department (USPOD) to carry mail aboard high-speed passenger trains; and the Railway Mail Service enforced various standardized designs on RPOs. In fact, a number of companies maintained passenger routes where the financial losses from moving people were more than offset by transporting the mail.

The Moment of the Pull
Demo of the mail hook pulling a mail bag on Chicago, Burlington and Quincy Railroad #1923 at the Illinois Railway Museum.


The world's first official carriage of mail by rail was by the United Kingdom's General Post Office in November 1830, using adapted railway carriages on the Liverpool and Manchester Railway. Sorting of mail en route first occurred in the United Kingdom with the introduction of the Travelling Post Office in 1838 on the Grand Junction Railway[1][2] following the introduction of the Railways (Conveyance of Mails) Act 1838.

In the United States, some references suggest that the first shipment of mail carried on a train (sorted at the endpoints and merely carried in a bag on the train with other baggage) occurred in 1831 on the South Carolina Rail Road. Other sources state that the first official contract to regularly carry mail on a train was made with the Baltimore and Ohio Railroad in either 1834 or 1835. The United States Congress officially designated all railroads as official postal routes on July 7, 1838.[2] Similar services were introduced on Canadian railroads in 1859.[3]

First RPO 1862 ppc.jpeg
The first RPO (1862)

The Railway post office was introduced in the United States on July 28, 1862, using converted baggage cars on the Hannibal and St. Joseph Railroad (which also delivered the first letter to the Pony Express). Purpose-built Railway Post Office (RPO) cars entered service on this line a few weeks after the service was initiated. Their purpose was to separate mail for connection with a westbound stagecoach departing soon after the train's arrival at St. Joseph. This service lasted approximately one year.[4] The first permanent Railway Post Office route was established on August 28, 1864, between Chicago, Illinois, and Clinton, Iowa.[5] This service 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.[6]

Great Northern RPO No 42 interior
An interior view of Great Northern Railway #42, a restored RPO on display at the California State Railroad Museum in Sacramento.

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.[7]

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.[8]

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.[9]

Railway Post Office at work 1965
A working RPO on the Chicago and North Western in 1965.

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 remarkably short time. Railway mail clerks were subjected to stringent training and ongoing testing of details regarding their handling of the mail. On a given RPO route, each clerk was expected to know not only the post offices and rail junctions along the route, but also specific local delivery details within each of the larger cities served by the route. Periodic testing demanded both accuracy and speed in sorting mail, and a clerk scoring only 96% accuracy would likely receive a warning from the Railway Mail Service division superintendent. Interurban and Streetcar systems were also known to operate RPOs. The Boston Elevated Railway car being noted as making circuits of the city to pick up mail.[10]

In the United States, RPO cars (also known as mail cars or postal cars) were equipped and staffed to handle most back-end postal processing functions. First class mail, magazines and newspapers were all sorted, cancelled when necessary, and dispatched to post offices in towns along the route. Registered mail was also handled, and the foreman in charge was required to carry a regulation pistol while on duty to discourage theft of the mail.


Interior of Great Northern Railway Post Office Car 42
Interior of Great Northern Railway Post Office Car 42 at the California State Railroad Museum

Because of the physical and mental demands placed on RPO clerks, the Railway Mail Service pushed the adoption of standardized floor plans and fixtures for all RPO cars, with the first plans published in 1885. The RMS also pressed for improved lighting fixtures to help the clerks see the addresses on the mail they sorted, first by improving the reflectors in the 1880s, then calling for discontinuance of oil lamps in the 1890s and the first experiments with electric lighting in 1912. Clerks' safety was also of great concern to the RMS, with the first comprehensive statistics on work-related injuries published in 1877.[11]

Through the second half of the 19th century, most RPO cars were painted in a somewhat uniform color scheme regardless of the railroad that owned or operated them. Most were painted white with trim in either buff, red or blue, which made the cars stand out from the other cars. By the 1890s, this practice had waned as railroads painted their RPO cars to match the rest of their passenger equipment. One RPO car that was displayed at the 1893 World's Columbian Exposition in Chicago is one of the last known examples of the early white color scheme.[12]

As the development of passenger cars progressed, so too did the development of RPO cars. The first plans for RPO car designs were based on light baggage car frames and bodies, which sometimes resulted in catastrophe for RMS employees when the trains were involved in accidents. From 1900 to 1906 some 70 workers were killed in train wrecks while on duty in the RPOs, leading to demands for stronger steel cars.[13] The RMS developed its first standards for car design in 1891 to address some of these issues.[14] In 1912, the Railway Mail Service developed a set of strength requirements for new cars in an effort to push the car building companies into using steel for the cars' major structural components and underframes. The core of the requirements was that each car should be able to withstand a buffer force of at least 400,000 pounds. This requirement was doubled to 800,000 pounds in a 1938 revision of the standards. The requirements were again strengthened in 1945 with specifications that precluded the use of aluminium for framing and major structural components. The 1945 revisions also included a requirement for end posts to prevent telescoping in the event of a collision. Car manufacturers adopted these requirements and carried them through to all other models of passenger cars that they built.[15] The 800,000 lb buffer load and end post requirements were later adopted by the Interstate Commerce Commission (ICC) for all passenger MU locomotives as of April 1, 1956[16] and to all passenger cars and locomotives in 1999 by the USDOT.[17] An interesting feature of most RPO cars was a hook that could be used to snatch a leather or canvas pouch of outgoing mail hanging on a track-side mail crane at smaller towns where the train did not stop. The first US patent for such a device (U.S. Patent 61,584) was awarded to L.F. Ward of Elyria, Ohio, on January 29, 1867.[18] With the train often operating at 70 mph or more, a postal clerk would have a pouch of mail ready to be dispatched as the train passed the station. In a co-ordinated movement, the catcher arm was swung out to catch the hanging mail pouch while the clerk stood in the open doorway. As the inbound pouch slammed into the catcher arm, the clerk kicked the outbound mail pouch out of the car, making certain to kick it far enough that it was not sucked back under the train. An employee of the local post office would retrieve the pouch and deliver it to the post office.

In the 1950s the Budd Company offered two versions of its self-propelled diesel RDC with RPO: the RDC-3 combine and the RDC-4 (a baggage/mail/express only unit). These models were purchased by the New York Central, Boston & Maine, New Haven Railroad, Rock Island, Pacific Great Eastern, Northern Pacific, Canadian Pacific Railway, Canadian National and Minneapolis & St. Louis.[19]

CBQ 1926 20050716 Illinois Railway Museum

Chicago, Burlington and Quincy Railroad #1923, a heavyweight RPO preserved at the Illinois Railway Museum.

RPO interior

The interior of an RPO on display at the National Railroad Museum in Green Bay, Wisconsin.

CBQ 1926 mail hook detail

A close-up view of the mail hook on CB&Q #1923.

Great Northern RPO No 42

A view of the mail hook on GN #42, along with a track-side mail crane complete with mail bag.

BML 73 Short Line RPO 1947

Belfast & Moosehead Lake RR #15 RPO, Belfast, ME 1947

Postal railway

Former Richmond, Fredericksburg and Potomac Railroad post office (1916), on display at RF&P Park, Glen Allen, VA.

Cancellation stamps

Most RPO cars had a mail slot on the side of the car, so that mail could actually be deposited in the car, much like using the corner mail box, while the train was stopped at a station. Those desiring the fastest delivery would bring their letters to the train station for dispatch on the RPO, knowing that overnight delivery would be virtually assured. The mail handled in this manner received a cancellation just as if it had been mailed at a local post office, with the cancel giving the train number, endpoint cities of the RPO route, the date, and RMS Railway Mail Service or PTS Postal Transportation Service between the killer bars. Collecting such cancellations is a pastime of many philatelists and postal history researchers.

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.

Decline and withdrawal

At their height, RPO cars were used on over 9,000 train routes covering more than 200,000 route miles in North America. While the majority of this service consisted of one or more cars at the head end of passenger trains, many railways operated solid mail trains between major cities; these solid mail trains would often carry 300 tons of mail daily.[2][A]

R.P.O. postal cancellation applied to mail handled in the railway post office car of Nashville, Chattanooga and St. Louis Railway's Nashville & Memphis train No. 5, the inaugural eastbound run of the City of Memphis.[20]

After 1948, the railway post office network began its decline although it remained the principal intercity mail transportation and distribution function within the Post Office Department (POD). There were 794 RPO lines operating over 161,000 miles of railroad in that year. Only 262 RPO routes were still operating by January 1, 1962. In 1942, the POD began experimenting with a highway version of the RPO to serve the same purposes along routes where passenger train service was not available. These highway post office (HPO) vehicles were initially intended to supplement RPO service, but in the 1950s and 1960s, HPOs often replaced railway post office cars after passenger train service was discontinued. The last interurban RPO service was operated by Pacific Electric Railway on its route between Los Angeles and San Bernardino, California.[21] When the post office made a controversial policy change to process mail in large regional "sectional centers," mail was now sorted by large machines, not by people, and the remaining railway post office routes, along with all highway post office routes, were phased out of service. In September 1967 the POD cancelled all "mail by rail" contracts, electing to move all First Class mail via air and other classes by road (truck) transport. This announcement had a devastating effect on passenger train revenues; the Santa Fe, for example, lost $35 million (US) in annual business, and led directly to the ending of many passenger rail routes.

After 113 years of railway post office operation, the last surviving railway post office running on rails between New York and Washington, D.C. was discontinued on June 30, 1977. The last route with a railway post office title was actually a boat run that lasted a year longer. This Boat Railway Post Office was the Lake Winnipesaukee RPO operating between The Weirs, New Hampshire, and Bear Island on Lake Winnipesaukee. The final date it operated with a postmark was September 30, 1978.


Interurban Railway Museum October 2015 13 (Texas Electric Railway Car 360)
The RPO section of preserved Texas Electric Railway Car 360, at the Interurban Railway Museum in Plano, Texas

Many RPO cars have been preserved in railroad museums across North America; some of the cars are kept in operational condition. In 1933, Chicago, Burlington and Quincy Railroad rebuilt one of its baggage cars into a replica of the first RPOs that were used on the Hannibal and St. Joseph in 1862. The railroad displayed the car in several cities along the railroad; it now resides at the Patee House Museum in St. Joseph, Missouri.[5]

The Minnesota Transportation Museum (MTM) maintains Northern Pacific #1102, a 1914 Mail RPO, that is classed as a "combine" car, having sections for the RPO, Railway Express Agency and twenty seats for paying passengers. Currently, it is the only Railway Post Office car known to be operational and currently certified for operation on commercial rail. The Osceola & St Croix Valley Railway (division of MTM/reporting mark MNTX) operates the car as part of its tour line, actually "catching the mail on the fly" as a part of its regular runs.

As part of the 40th anniversary of the end of RPO service, Minnesota Transportation Museum will be placing #1102 on display at Saint Paul Union Depot as part of its "Last Mail Train" for National Train Day, 6 May 2017. At the end of the day, Great Northern 400, Northern Pacific RPO #1102 and two coaches will be departing Union Depot as Train #1 bound for Osceola, Wisconsin. It will be hauling commemorative envelopes and cards to be sent all across the United States, following which it will operate in regular service as part of the Museum operations out of Osceola, WI.

Steamtown National Historic Site in Scranton, PA has RPO car #1100, Louisville & Nashville, on display. It is an all-steel car built in 1914 by the American Car and Foundry Company.

See also


  1. ^ As the United States Postal Service undergoes its fiscal crisis in the second decade of the 21st Century, it is well to note that these are not entirely new problems. A national pick up and delivery system to remote and small locales is a fiscally challenging model. "A Congressional Investigation of the United States Post Office Department in 1900 disclosed that postal expenditures were not and, in some cases, could not be apportioned to revenues. A remarkable anomaly in Maine, at the intersection of mail bags and a printing press, provided, at the time, a basis for costing questions of policy and regulation and, for us now, an understanding of the postal commons in its Golden Age." DeBlois, Diane; Harris, Robert Dalton. "It's in the Bag" – The Shape of Turn-of-the-Century Mail" (PDF). Retrieved August 16, 2012.



  1. ^ Johnson 1995.
  2. ^ a b c White, p 472.
  3. ^ White, p 473
  4. ^ White, p 475.
  5. ^ a b "First as well as fast". Classic Trains. Vol. 7 no. 3. Fall 2006. p. 27. ISSN 1527-0718.
  7. ^ White, pp 475-476.
  8. ^ White, pp 481-482.
  9. ^ Central Pacific Railroad Photographic History Museum
  10. ^ Trolley Car Treasury by Frank Rowsome Jr. McGraw-Hill New York 1956 Library of Congress 56-11054
  11. ^ White, p 482.
  12. ^ White, p 480.
  13. ^ Daily Mirror March 16, 1906 p6 Last night's news
  14. ^ White, p 483.
  15. ^ White, p 190.
  16. ^ 49 CFR Part 229.141, 2015 edition (10-1-2015) https://www.gpo.gov/fdsys/pkg/CFR-2015-title49-vol4/xml/CFR-2015-title49-vol4-sec229-141.xml
  17. ^ 49 CFR Part 238, Subpart C, U.S. Department of Transportation, Federal Railroad Administration, 2015 edition https://www.gpo.gov/fdsys/pkg/CFR-2015-title49-vol4/xml/CFR-2015-title49-vol4-part238-subpartC.xml
  18. ^ White, p 476.
  19. ^ Budd Company Red Lion Plant Order List, Philadelphia Chapter of the National Railway Historical Society. http://www.trainweb.org/phillynrhs/BuddCarOrders.html
  20. ^ Nashville, Chattanooga & St. Louis Railway: The Dixie Line by Charles B. Castner, Jr. page 92 ISBN 0-911868-87-9
  21. ^ Demoro, Harre W. (1986). California's Electric Railways. Glendale, California: Interurban Press. p. 19. ISBN 0-916374-74-2.


Further reading

External links

Air Mail Facility

An Air Mail Facility is an installation for Airmails of the United States.

Boat Railway Post Office

Post was transported over water in the United States in the later nineteenth and the twentieth century.

Bureau of Transportation

The Bureau of Transportation of the United States Post Office Department was established in 1960. 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. 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.

Catcher pouch

A catcher pouch was a mail bag used by Railway Post Offices of the nineteenth century and the early twentieth century. Its use was limited to exchanges onto moving trains. The specially constructed catcher pouch was grabbed by the catcher mechanism in the passing railway car and the catcher pouch would release from the holding rings on the mail crane. This technique was known as "mail on the fly". Starting in the 1870s the use of this technique of the Railway Mail Service was an important issue in the United States. It was a popular technique and the backbone of the United States Postal Service through the 1930s.

Domestic Mail Manual

The Domestic Mail Manual (DMM) is a document that lays out the policies and prices of the United States Postal Service (USPS). In legal parlance, it contains "the Mailing Standards of the United States Postal Service". Changes to the DMM are announced in the Federal Register. The DMM sets postage rates and all other aspects of the USPS' service delivery.

Flats (USPS)

The United States Postal Service uses the words "flats" and "nonletters" interchangeably to refer to large envelopes, newsletters, and magazines.

Highway Post Office

The term Highway Post Office refers to brightly colored red, white and blue buses used to carry mail to multiple areas over wide distances.

Due to withdrawal of many Railway Post Office (RPO) trains from service, the U.S. Post Office Department decided to experiment with distribution of mail on large buses equipped similarly to RPO cars. On February 10, 1941, experimental service started on the Washington, DC & Harrisonburg, Virginia HPO. It was a success from the start, but due to World War II, expansion of the service was delayed for several years. After the war, the service increased rapidly, with more than 130 routes established between 1948 and 1955. As this service was somewhat enmeshed with the RPO service, its value decreased as RPOs were abolished. The last HPO service to operate in the U.S. was the Cleveland, Ohio, & Cincinnati, Ohio HPO, which was discontinued in 1974.

Information-Based Indicia

Information-Based Indicia (IBI) refers to a secure postage evidencing standard used by the United States Postal Service (USPS) to indicate electronic postage payment.Information-Based Indicia is a 2-dimensional PDF417 or data matrix barcode combined with human-readable information. The barcode data contains such information as amount of postage, origin zip code, destination, mail class, weight, confirmation/tracking numbers, and a cryptographic signature. The human-readable information shows at a minimum the information required by the USPS Domestic Mail Manual (DMM).

J. W. Westcott II

J. W. Westcott II is a boat known for its delivery of mail to ships while they are underway. It operates out of Detroit, Michigan, and is the only floating ZIP Code in the United States.

Mail hook

A mail hook is an installation at a railroad where a catcher pouch can be hung, to be picked up by a passing train without the train having to stop. See further discussion at Railway post office.

Mail jumping

Mail jumping is a type of mail delivery. The person doing the mail jumping (known as a mail jumper) is transported on a body of water by a boat. The person jumps off the boat onto a dock, places incoming mail in a mailbox, retrieves outgoing mail, and jumps back onto the boat. The boat continues to move at a slow and steady pace (about 5 miles per hour (8 km/h)) while the mail jumper is jumping.

Network Distribution Center

A Network Distribution Center (NDC) is a highly mechanized mail processing plant of the United States Postal Service that distributes standard mail and package services in piece and bulk form.

Passenger car (rail)

A passenger car (known as a coach or carriage in the UK, and also known as a bogie in India) is a piece of railway rolling stock that is designed to carry passengers. The term passenger car can also be associated with a sleeping car, baggage, dining, railway post office and prisoner transport cars.

In some countries, such as the UK, some coaching stock (whether designed, converted or adapted) to not carry passengers are referred to as "NPCS" ( non-passenger coaching stock); similarly some maintenance (engineering) stock can be known as "MOW" – maintenance of way – in the US.

Postal Transportation Service

The Postal Transportation Service (PTS) was the renamed successor to the Railway Mail Service of the United States Post Office Department from 1 October 1949. Although this branch of the service had been in charge of all transit mail, some parts had little to do with railroads, even though they were still the most important part of the service. In 1950, of the 32,000 clerks assigned to the PTS, only about 16,000 actually worked on trains. The remainder were in terminals, transfer offices, Air Mail Facility, Highway Post Offices (HPO), administrative offices, etc. Boat Railway Post Office (Boat RPO), Streetcar Railway Post Offices, and the Seapost Service had already been discontinued. The name of the Chief Clerk's office was changed to District Superintendent's office.

During the preceding decades, only one or two clerks per year had lost their lives in wrecks and several years saw no fatalities. When Pennsylvania Railroad's crack "Red Arrow," New York City, New York & Pittsburgh, Pennsylvania Railway Post Office (RPO) Train 68, derailed in 1947 at Bennington Curve (West of Altoona, Pennsylvania), killing six clerks and badly injuring others, the whole country was shocked.

Even with all the trains that had been discontinued, the several round trips of RPO service on trunk lines, along with the expanded service and the star route highway services connecting the RPOs, maintained very good mail service through the 1950s. In the 1950s the Post Office Department turned the supervision of what had been the PTS Terminals over to the postmasters where the terminals were located.

Railway Mail Service

The United States Postal Service's Railway Mail Service was a significant mail transportation service in the US from the mid-19th century until the mid-20th century. The RMS, or its successor the Postal Transportation Service (PTS), carried the vast majority of letters and packages mailed in the United States from the 1890s until the 1960s.

Railway Mail Service library

The Railway Mail Service (RMS) Library is a major collection of materials pertaining to en route distribution history. Incorporated in May 2003, it can assist researchers interested in Railway Mail Service, route agent, Seapost, Railway Post Office (RPO), and Highway Post Office (HPO) history. The collection has many unique, original-source documents that provide answers to questions dealing with the transportation and distribution of USA Mail between 1862 and 1977, as well as other countries during the 19th century and 20th century.

Streetcar Railway Post Office

Streetcar Railway Post Office (RPO) routes operated in several major USA cities between the 1890s and 1920s. The final route was in Baltimore, Maryland. The Mobile Post Office Society, Affiliate 64 of the American Philatelic Society, has published monographs detailing the operational history of each route.

These were cars that had interior fixtures similar to railway-route RPOs. One or two clerks worked in the Streetcar RPO to sort mail for post office stations and branches along the route, as well as connecting RPOs that served the city.

Terminal Railway Post Office

Terminal railway post offices were sorting facilities which were established by the Railway Mail Service to speed the distribution of parcel post. These offices were usually located in or near railroad stations in major cities or junction points. Terminal railway post offices operated generally from 1913-1914 into the mid-1960s, before their function was absorbed by post office sectional centers.

Title 39 of the United States Code

Title 39 of the United States Code outlines the role of United States Postal Service in the United States Code.

Part I—General

Part II—Personnel

Part III—Modernization and Fiscal Administration

Part IV—Mail Matter

Part V—Transportation of Mail

Head-end equipment
coaches or cars
Miscellaneous equipment

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