The Postal Service ended most railway post office contracts in 1967, which brought about the end of the Silver Age of passenger trains as most railroads ran RPOs with passenger trains and depended on the income from RPOs to supplement passenger revenue. But apparently the Postal Service kept a few RPOs going between New York and Washington until June 30, 1977, by which time passenger trains were run by Amtrak.

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The 13 cents worth of postage on this cover are provided by a 10 cent stamp commemorating 200 years of Postal Service (only about 140 years of which involved railroads) plus a 3 cent stamp, first issued in 1952 (when first class postage was 3 cents), commemorating 125 years of the Baltimore & Ohio Railroad.
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John D’Aloia provided two of these envelopes. The first one above was used on the southbound train to Washington and has a Washington postmark on the back while the second one was used on the northbound train to New York and has a New York postmark on the back. On this one, the 3-cent stamp is from 1944 and celebrates the 75th anniversary of the first transcontinental railroad.