The Block Signal

Joe Ryan, a veteran train engineer, is demoted to a flagman position after a disastrous crash-- one caused by his cowardly and opportunistic partner. Though Ryan's failing eyesight is named as the cause of the crash, he's undeterred as he designs an automatic braking invention.

• Frank O'ConnorDirector

• Ralph Lewis'Jovial Joe' Ryan
• Jean ArthurGrace Ryan
• Hugh AllanJack Milford
• George ChesebroBert Steele
• Sidney Franklin'Roadhouse' Rosen
• Leon Holmes'Unhandy' Andy
• Missouri RoyerJim Brennan