As somebody that grew up on (EMD-only) Rio Grande, it is great listening to the classic two-stroke prime movers in RMRX 8020 and RMRX 8021 as they pull the Rocky Mountaineer west up the grade.
I should probably clarify my statement of Rio Grande being "EMD-only". While it is true that, over the years, Rio Grande did own some GE and ALCO units, by the time I was old enough to go train chasing with my dad, Rio Grande was an EMD-only railroad.
