Dan Foster, the engineer of the Black Diamond Express express train falls in love with Jeanne Harmon, whose snobbish, high society mother, Mrs. Harmon, does not approve of the blue-collar, rough-at-the-edges Dan Foster as a suitable husband for Jeanne.
| Actor | Role |
|---|---|
 Monte BlueDan Foster | Dan Foster |
 Edna MurphyJeanne Harmon | Jeanne Harmon |
 Myrtle StedmanMrs. Harmon | Mrs. Harmon |
 Claire McDowellMartha Foster | Martha Foster |
 Carroll NyeFred Foster | Fred Foster |
 William DemarestTrain Engine Fireman | Train Engine Fireman |
 Jack W. JohnstonSheldon Truesdell | Sheldon Truesdell |
| AAusten JewellLittle Daniel (uncredited) | Little Daniel (uncredited) |