Osawatomie History & Railroad Museums

The story of Osawatomie is preserved and displayed at the Osawatomie History & Railroad Museum in artifacts and records of the concepts, habits, skills, arts, instruments, and institutions of the residents and its surrounding area.

From its beginning as an Indian Mission to its fame as an “abolitionists’ nest” during the territorial Border Wars, to its recognition as a railroad metropolis, and a national leader in mental health, Osawatomie Kansas, has truly been “one of a kind”. Unique in name and character, Osawatomie, and its story provide insight into events in Kansas, and the nation.

The Story is complex, evolving from the events and the people who have contributed to its development and telling.

We hope you can find time to visit our museums with your friends and family soon to see the story of Osawatomie.

Osawatomie History Museum

The Osawatomie History Museum, founded in 1990, focuses on the history of the city itself from territorial Kansas period, through evolution from rural life to current establishments and the people who experienced those changes.

Osawatomie Railroad Museum

The MoPac Railroad Depot Museum, opened in 2002, is a replica of the 1890 Missouri Pacific passenger depot that celebrates the “glory days” of railroading. Caboose #942, the last surviving horizontal wood sheathed caboose in the Missouri Pacific Line has been restored to 1940’s condition.

Focus on History

Captain Thomas H. “Tommy” Dyer, United States Navy

Navy Distinguished Service Cross – August 1946

National Security Agency 2002 Hall of Honor Inductee

Navy Hall of Honor ID :2451

Captain Thomas H. “Tommy” Dyer, a native of Osawatomie, Kansas, was one of the Navy’s most influential cryptanalysts and a driving force behind U.S. codebreaking successes in World War II. As lead cryptanalyst at Station HYPO from 1936 to 1945, he helped break key Japanese naval codes—including JN‑25—providing intelligence that shaped victories at Coral Sea, Midway, and in the operation that downed Admiral Isoroku Yamamoto. His innovations in machine‑assisted cryptanalysis earned him recognition as “the father of machine cryptanalysis.”

For his exceptionally meritorious wartime service, Dyer received the Navy Distinguished Service Medal. After the war, he played major roles in the Armed Forces Security Agency and the National Security Agency, where he helped establish the Agency’s first academic training programs and later served as its first historian. He retired from the Navy in 1955 and passed away in 1985.