Since 2009, the Sierra Railway Historical & Modelers Seminar has been an annual gathering of fans, students, and modelers of the Sierra Railway/Railroad and the other railroads in Tuolumne County, California. In 2022 the Seminar became a program of the Tuolumne Historical Railroad Association, Inc. (THRA).

The date for the 2024 Sierra Railway Historical & Modelers Seminar will be Sunday April 21, 2024. The Seminar will be held at the Black Oak Casino Hotel in Tuolumne City. Updates on the details of the Seminar will be posted on this page as they are finalized. Past attendees will be notified via email. Registration for the 2024 event begins in January. THRA members receive a discount on admission to the Sierra Seminar.

The annual West Side Reunion – focusing on logging railroads – will also be held at the Black Oak Casino Hotel the same weekend: Saturday April 20, 2024. It is a separate event with its own admission charge. For additional Reunion information and registration please visit or contact Frank at

We hope you can join us for one or both great days of learning and camaraderie featuring a variety of historical and modeling presentations.

Sierra Railway Seminar