We can hear the Chief whistle in each direction every day that it passes through our part of New Mexico. But the author didn't even take a photograph of my station, Lamy NM (the get-off point for Santa Fe). Unbelievable! :)

We've only done the Lamy<->Chicago section of the Chief, but the timing is so great for that: depart both places mid-afternoon, arrive 25 hrs later (delays notwithstanding).