i am searching for a western film that i vaguely recall watching in the early 1960s. two men (and a woman?) find themselves alone and stranded, without supplies or transportation, in the mexican desert in the late 19th century. they walk and come across a railroad track. they follow the line and find an overturned two man handcar. they get the handcar back on the railroad track. then they operate the handcar until they get to a big city (vera cruz?). there is a gunfight of some sort, and they win the gun fight. iirc, the movie has two famous...