Route map of the Baltimore and Ohio's Diplomat.
Diplomat drumhead
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Ink blotter advertising Roomettes on the Diplomat and National Limited.

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Route map of the Baltimore and Ohio's Diplomat.

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After the B&O's discontinuation of passenger service to New York on April 26, 1958, the eastern terminus of the Diplomat was Washington, D.C.. Unfortunately, the B&O was never in a position to directly compete against the much faster and more populous routes the New York Central and Pennsylvania Railroad trains used between New York and St. Louis. Instead, the B&O concentrated on service, and won consistent loyalty from business travelers and the general public alike. However, the B&O suffered from a lack of large population centers along the route. Only Cincinnati, Ohio, represented a truly large city big enough between Washington and St. Louis that could add a significant amount of passenger traffic. With the National Limited already serving the route, and with few sources of additional revenue, the following year in 1959, The Diplomat was withdrawn entirely from service.

The Diplomat was equipped with a dining car, lounge car, and Pullman sleeping cars, in addition to coaches.

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The Diplomat
The Diplomat was a named passenger train of the Baltimore and Ohio Railroad (B&O) during the 1920sā€“1950s connecting New York City, and St. Louis, Missouri, via Washington, D.C. Other B&O trains on the route during that period were the premier National Limited and the workhorse Metropolitan Special. The train was inaugurated in August 1930 after several changes to trains along the St. Louis Route. After World War II, the Diplomat operated as Train No. 3 westbound, and No. 4 eastbound. It was timed to provide connections to several western railroads that terminated in St. Louis, including the Frisco, the Santa Fe, Cotton Belt and Missouri Pacific, among others.

B&O's New York terminal was actually in Jersey City, New Jersey, using the New Jersey Central's Jersey City Terminal. Passengers were then transferred to buses that met the train right on the platform. These buses were then ferried across the Hudson River to Manhattan, where they proceeded to various "stations" including the Vanderbilt Hotel, Wanamaker's, Columbus Circle, and Rockefeller Center, as well as Brooklyn.

Ink blotter advertising Roomettes on the Diplomat and National Limited.

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Route and schedule
In 1947, westbound Diplomat Train No. 3 operated on the following schedule (departure times at principal stops shown):
City / Departure time
New York (Rockefeller Center) 1:15 p.m.
New York (42nd Street Station) 1:25 p.m.
Brooklyn, NY 1:20 p.m.
New York (Columbus Circle Station) 1:20 p.m.
Jersey City, NJ 2:15 p.m.
Elizabeth, NJ 2:32 p.m.
Philadelphia, Pa. 3:58 p.m.
Wilmington, Del. 4:27 p.m.
Baltimore, Md. (Mt. Royal Station) 5:46 p.m.
Baltimore, Md. (Camden Station) 5:54 p.m.
Washington, D.C. (Union Station) 7:00 p.m.
Cincinnati (Union Terminal) 8:05 a.m.
Louisville, Ky. 10:35 a.m.
St. Louis (Union Station) 2:55 p.m.
(Source: Baltimore and Ohio System Timetable, July 6, 1947)