Of course the script is highly improbable and the acting is rather overwrought, but this was a serial, which thankfully has been condensed into about 80 minutes. In those eighty minutes are some truly remarkable shots of steam trains, train yards, a roundhouse, train stations, the cabs of locomotives and the interiors of passenger cars. The producers obviously sought to save money on set construction by using actual locations, and their economy is our gain. For good measure, there is also some considerable footage of the airplanes and air fields of the time, including the interior of a passenger airplane. Early John Wayne is always welcome, but this film has some extremely worthwhile footage and locations. And look for a scene about 25 minutes into the film, where an uncredited Yakima Canutt is duplicated in a special effects shot.