The Block Signal is 1926 American silent drama film directed by Frank O'Connor and starring Ralph Lewis, Jean Arthur, and Hugh Allan.

[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.

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