844 and centennial 6936 lay over at Denver’s Union Station, before the big re-development. The Amtrak unit is a backup that did end up being used this day. And the Ski train is waiting on the next track over.
The GE Genesis series are well known for being Amtrak's locomotive. With confirmation of retirement from Amtrak themselves, their time is limited. Now is your chance to catch them before the chargers arrive!