[Accrs] UP 4014 - Exhaust Flare

[Alameda County Central Railroad Society]

Take a look at this video of 4014 entering a curve.   At 37 seconds in this video is a gas flare or something that comes out of the stack.  I’ve never seen this happen on other engines before.  What would cause this?

https://www.youtube.com/watch?v=RQKF3d9Ct40


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