Between the 2023-2024 seasons, the Rocky Mountaineer leased this (former) SD45, now an SD40-2 internally. An SD18 was also leased to shuffle cars around in Denver. The GP40-3s have had a lot of mechanical issues and the RM has had to lease power from UP. Apparently, the lease of both of these units is less expensive than the cost to lease on UP SD70M. It took most of the 2024 season for PTC to be installed in RMRX 8600. But with it now installed and operable, it is on the train west with one of the GP40-3s at East Portal.
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