Jim;
Great video... thanks for posting. As HW mentioned above, this was for an IMAX film due out next year - can’t wait to see it. While looking online, I found another YouTube video from the same period (not sure it will be part of the film) where the “pacing” was done by a drone. You get to see more of the train and the scenery. There is a great shot where 4449 is on a siding to allow an intermodal freight pass.