Most railfans are familiar with this or similar photos. It shows the so-called High Line in Animas Canyon and has been published numerous times. What you can't see is the nearly vertical drop-off into the canyon to the right of the train. "All passengers please rush to the right side of the train and we'll see if we can tumble into the canyon", drones the brakeman over the loudspeakers. I started looking for a guardrail at that point in the trip.