"Woodward leaned toward their known policy according to which governors are perfect and must only be touched on test stands at Woodward plant". That cracked me up. A former coworker apprenticed and became a journeyman machinist at the plant. They probably still wear bow ties on the floor every day. Page 196 of the Tromel document is worth a lot. The questions remain, what turbos do the ex WP&Y engines have, is that different than what the Peruvian and Chilean DL535s had? The Tromel doc states the last dozen locomotives do NOT have the 350 turbo. Were they built to go North or South? Sounds like the research has been done and it's a matter of putting the package together to have these DL535s operate to their full capability at altitude, oh and they won't smoke or coke up as much.

https://vintagedieseldesign.com/2021/04 ... ntal-alco/

I would love to see a photo of this thing... There must be one around somewhere.

According to the Tromel report, one was built, and a long endurance test performed in their lab. It likely no longer exists. It would seem a properly sized blower would bring performance immediately up to expectations in Antonito and Chama with less disappointment on the pass, no turbo lag and less smoke. Unfortunately, engineering such a conversion, even with blueprints, would be much more involved and costly than applying a proper turbo, governor and control package. Unless D&S finances a solution, I'm afraid these DL535s will always operate at less than their potential.