@MELGAR posted:Ron,
After building the Union Pacific 9000 series with six coupled axles (4-12-2), the next step was to separate the six axles into two sets of three, resulting in the articulated Challenger locomotive (4-6-6-4), to track better on curves.
MELGAR
Hi Mel,
Another fact about #9000, it's farewell run was March 11, 1956 pulling a steam excursion Denver-Cheyenne roundtrip for the Rocky Mountain Railroad Club.roundtrip.
Ron