Danger Lights

The plot concerns railroading on the Chicago, Milwaukee, St. Paul and Pacific Railroad, and the movie was largely filmed along that railroad’s lines in Montana. The railway yard in Miles City, Montana was a primary setting, while rural scenes were shot along the railway line through Sixteen Mile Canyon, Montana. Additional footage was shot in Chicago, Illinois.

By George B. Seitz (https://www.youtube.com/watch?v=5yrnDDa3QMI) [Public domain], via Wikimedia Commons

Info.

Movie info:
Danger Lights
Directed by George B. Seitz
Produced by William LeBaron, Myles Connolly
Written by James Ashmore Creelman
Starring Louis Wolheim, Robert Armstrong, Jean Arthur
Cinematography Karl Struss, John W. Boyle
Edited by Archie F. Marshek
Distributed by RKO Pictures
Release dates November 15, 1930
Running time 74 minutes
Country United States
Language English