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: Ch. 1: The First Challengers; Ch. 2: Union Pacific Influence; Ch. 3: Passenger Assigned; Ch. 4: Modifications 3900-3939 Early Series; Ch. 5: Operations 3900-3939 Early Series; Ch. 6: Jabelmann Power; Ch. 7: Extra 3950 West; Ch. 8: War-Time Duplicates; Ch. 9: Last Steam Design; Ch. 10: Modifications Later Series; Ch. 11: Operations Later Series.
Auto-Liner, hardcover, 144 pages, standard portrait book 8 x 10 in., B&W photographs.