"Engineer Johnny Munroe is enlisted to build a railroad tunnel through a mountain to reach mines. His task is complicated, and his ethics are compromised, when he falls in love with his boss's daughter"
John Wayne
as Johnny Munroe
Laraine Day
as Maura Alexander Munroe
Cedric Hardwicke
as Frederick Alexander (as Sir Cedric Hardwicke)v
Judith Anderson
as Miss Ellen Braithwaite
Anthony Quinn
as Ricky Vegas
James Gleason
as Pop Mathews
Grant Withers
as Fog
Paul Fix
as Joe
Fernando Alvarado
as Chico
Harry Woods
as Holden
Michael Harvey
as Curly
Charles Trowbridge
as Señor Tobar
Martín Garralaga
as Chavez
Blanca Vischer
as Young Woman (uncredited)
Max Wagner
as
Brick Sullivan
as Foreman with Holden at Fiesta (uncredited)
Jan Sterling
as Dancer at Fiesta (uncredited)
Julian Rivero
as Priest (uncredited)
C.E. Scoggins
Novel
Borden Chase
Screenplay
Richard Wallace
Director
John Twist
Sam Ruman
Production Manager
Clem Portman
Sound
Frank Doyle
Editor
Carroll Clark
Art Direction
John L. Cass
W. Howard Greene
Director of Photography
Harry J. Wild
Stephen Ames
Producer
Grayson Rogers
Assistant Director
Albert S. D'Agostino