The Block Signal is 1926 American silentdrama film directed by Frank O'Connor and starring Ralph Lewis, Jean Arthur, and Hugh Allan. It was produced by the independent company Gotham Pictures.^[1][2]

A veteran railroad engineer discovers that his eyesight is failing and he is becoming colorblind. Bert Steele his fireman who craves promotion deliberately misleads him about a signal leading him to be demoted. Jealous and frustrated by his unrequited love for the engineer's daughter Grace, Steele considers a more direct form of sabotage.

• Ralph Lewis as 'Jovial Joe' Ryan
• Jean Arthur as Grace Ryan
• Hugh Allan as Jack Milford
• George Chesebro as Bert Steele
• Sidney Franklin as 'Roadhouse' Rosen
• Leon Holmes as 'Unhandy' Andy
• Missouri Royer as Jim Brennan

Prints of The Block Signal are preserved at the UCLA Film and Television Archive and Academy Film Archive.^[3]

• Connelly, Robert B. The Silents: Silent Feature Films, 1910-36, Volume 40, Issue 2. December Press, 1998. ISBN 978-0-913204-36-8
• Munden, Kenneth White. The American Film Institute Catalog of Motion Pictures Produced in the United States, Part 1. University of California Press, 1997. ISBN 978-0-520-20970-1

• The Block Signal at IMDb
• The Block Signal on YouTube