The Block Signal (Silent) - DVD

Veteran train conductor Joe Ryan realizes he's become color blind with age. Prospective engineer Bert Steele takes advantage of Joe's predicament during an evening train ride with him, and disaster results. Although Joe is demoted, the railroad is suspicious of Bert's motives and puts a plan in motion to show him up and put Joe back in the operator's cab. Illinois-born Ralph Lewis was a stage actor before beginning his film career; he a