Danger Lights
Louis WolheimDan Thorn
Robert ArmstrongLarry Doyle
Jean ArthurMary Ryan
Hugh HerbertProfessor
Frank SheridanEd Ryan
Robert EdesonTom Johnson
Alan RoscoeJim- WWilliam P. BurtChief Dispatcher
Jim FarleyJoe Geraghty
James DonlanPicnic Barker (uncredited)
Frank MillsHobo (uncredited)
Lee PhelpsRailroad Worker (uncredited)