The story of Union Pacific's Challenger 4-6-6-4 steam locomotives from development to their final years. Illustrated with Black-and-White 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., Black-and-White photographs.
