Division Point

Steam Locomotive
in HO scale


NP Monad® GN Herald® SP+S Herald®

Northern Pacific - SP&S - Great Northern
Class Z-6 4-6-6-4 Challengers

First developed by the Union Pacific, the northwestern railroads where quick to see the advantages of the Alco 4-6-6-4 "Challenger"s on mountain curves. Using U.P. information and working closely with Alco designers, the Northern Pacific received a total of 21 Class Z-6 Challengers beginning in 1936 and 1937. As usual, the SP&S ordered 6 Z-6s (oil-fired) of their own in 1937. Two of these were later leased to the Great Northern.

The NP/SP&S/GN Challengers were became work horses, hauling freight yet capable of pulling the "varnish" as well at 50+ mph These powerful locomotives lasted though the end of steam. As with later versions, all were scrapped by 1959.

We at the Division Point felt that these earlier Challengers would be a great follow-on to the Z-7s and Z-8s. As usual, Division Point and Boo-Rim will offer this LIMITED EDITION project in different numbers of both classes. The SP&S and GN versions will also be offered. Lighting is included and these will be DCC-ready. With a limited number of pieces to be produced, you are well advised to contact your dealer to reserve yours!

Road numbers, versions and delivery projections will be announced soon! Watch this page!

As usual, we are indebted to those folks who publish the information and photos we need. We urge you to buy their books and photos.
  • Northern Pacific Supersteam Era 1925-1945 by Robert L. Frey & Lorenz P. Schrenk (1985, Golden West Books, San Marino, CA)
  • Northern Pacific In Color Vol.1 1949-59 by Doug Nighswonger (2002, Morning Sun Books, Scotch Plains, NJ)
  • S.P.&S.: The Spokane, Portland & Seattle Railway by Ed Austin & Tom Dill (1996, Pacific Fast Mail, Edmonds, WA)
  • Articulated Steam Engines of North America Volume 1 by Robert A. LeMassena (1979, Sundance Publications, Silverton, CO)
  • Also, thanks to the NP, SP&S and GN Historical Societies for preserving the data!

Here's our initial selections:

ALCO-built (1936-37) Class Z-6, Northern Pacific Road Numbers 5100-5120
DP-9071 NP Challengers: NP Class Z-6 4-6-6-4 (Series 5100-5120), as-delivered number boards/plates, friction bearings with 2-F 20,000-gal,27-ton coal tender spacer
DP-9072 NP Challengers: Class Z-6 4-6-6-4 (Series 5100-5120), flying number boards, roller bearings with 2-F 20,000-gal,27-ton coal tender spacer
ALCO-built (1937) Class Z-6, Spokane Portland & Seattle Road Nunmbers 900-905
DP-9074 SP&S Challengers: SP&S Class Z-6 4-6-6-4 (Series 900-9051), as-delivered number boards/plates, roller bearings with 2-F 20,000-gal,6,000-gal oil tender (earlier herald) spacer
DP-9075 SP&S Challengers: SP&S Class Z-6 4-6-6-4 (Series 900-9051), flying number boards, roller bearings with 2-F 20,000-gal,6,000-gal oil tender (later herald) spacer
Leased (1939-1950) Class Z-6, Great Northern Road Nunmbers 4000-4001 (ex-SP&S 903,904)
DP-9077 NP Challengers: GN Class Z-6 4-6-6-4 (Series 4000-4001), as-delivered number boards/plates, roller bearings
with 2-F 20,000-gal,6,000-gal oil tender
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Last updated 01-15-2011, Copyright ©2011 by Division Point, Inc.