L'Énigme du Chicago Express

Charles McGraw Det. Sgt. Walter Brown

Marie Windsor Mrs. Frankie Neall

Jacqueline White Ann Sinclair

Gordon Gebert Tommy Sinclair

Queenie Leonard Mrs. Troll

David Clarke Joseph Kemp

Peter Virgo Densel

Don Beddoe Det. Sgt. Gus Forbes

Paul Maxey Sam Jennings

Harry Harvey Train Conductor

Peter Brocco Vincent Yost (uncredited)

George Chandler Accomplice Running Newsstand (uncredited)

Franklyn Farnum Train Passenger (uncredited)

Don Haggerty Det. Wilson (uncredited)

Milton Kibbee Tenant (uncredited)

Walter Merrill Officer Allen (uncredited)

Harold Miller Train Passenger (uncredited)

Bess Flowers Restaurant Diner (uncredited)

Ivan Browning Waiter (uncredited)

James Conaty Tenant in Apartment House Hallway (uncredited)