Auto-Liner, hardcover, 144 pages, standard portrait book 8 x 10 in., B&W photographs.
The story of Union Pacific's Challenger 4-6-6-4 steam locomotives from development to their final years. Illustrated with B&W photographs and extensive text.
Contents: The First Challengers,Union Pacific Influence,Passenger Assigned,Modifications 3900-3939 Early Series,Operations 3900-3939 Early Series,Jabelmann Power,Extra 3950 West,War-Time Duplicates,Last Steam Design,Modifications Later Series,Operations Later Series.
