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In page Rio Grande class K-37:

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Although the K-37s are actually about 2% lighter than the K-36s, they were erroneously thought to be much harder on track. The D&SNG originally owned four of the surviving K-37s, but they found that the #497 was too hard on their track and didn't handle the Animas Canyon section of the route as well as they would have hoped. Consequently, they traded #497 to the C&TS for K-36 #482 and #499 to Royal Gorge Park in Canon City for #486. However, the problems experienced by the D&SNG are now thought to have been isolated to locomotive #497's trailing truck and not universal to all K-37s.