4-6-6-4 "Challenger" Locomotives of the USA
The Great Northern Railway bought two 4-6-6-4s from its subsidiary, the
Spokane, Portland & Seattle Railroad These two ALCO-built, former
SP&S road numbers 903 and 904, were designated Class Z-6 and were given
road numbers 4000 and 4001 on the Great Northern. They had four 23 x 32
cylinders, 69" drivers, a boiler pressure of 250 psi, a tractive effort
of 104,500 lbs and weighed 621,000 pounds.
The two Great Northern "Challengers" were sold back to the SP&S, number
4000 in 1946 and 4001 in 1950.
Roster by Richard Duley
|Class||Qty.||Road Number||Year Built ||Builder ||Notes|
|Z-6|| 2||4000-4001||1937||ALCO||These locomotives were bought from the SP&S. Ex SP&S numbers 903 & 904. Number 4000 sold back to the SP&S in 1946 and number 4001 sold back to the SP&S in 1950.|
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