10/14/2026
3 envelopes, 1 railroad car, and a birthday worth remembering! ✉️🚂
In recognition of World Post Day on October 9 and American Archives Month, October’s Artifact of the Month features three framed envelopes commemorating the 50th birthday of Railway Post Office (RPO) Car No. 3401, now preserved at the Rosenberg Railroad Museum.
Their special ink markings record a celebration held at No. 3401’s previous home. Donated by the Gulf Coast Chapter of the National Railway Historical Society (NRHS), the framed envelopes were among the items housed within the RPO car.
RPO cars served as moving post offices, where clerks sorted mail while traveling between communities. These envelopes preserve another chapter in No. 3401’s story—and show how even small paper keepsakes can help us connect with the past.
Take a closer look at the framed envelopes in the Museum Gallery, and join us for a tour to learn more about No. 3401 and the postal clerks who worked aboard her!