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Steam & Excursion > Extra cylinder?Date: 03/19/10 19:51 Extra cylinder? Author: erneal4961 Hey guys: On locomotives like ATSF 3751 there is what appears to be an extra cylinder on top of the cylinder chest. What is that exactly and what does it do? Thanks!
Date: 03/19/10 20:04 Re: Extra cylinder? Author: LarryDoyle They are a form of drifting valve, to reduce backpressure in the cylinders when the engine is drifting with the throttle closed.
Here's a couple of threads when this was asked before. http://www.trainorders.com/discussion/read.php?11,1848134,1848134#msg-1848134 http://www.trainorders.com/discussion/read.php?10,654970,654970#msg-654970 You can find a few more by searching the steam forum for "Santa Fe bypass valves" for all dates. -Larry Doyle Edited 1 time(s). Last edit at 03/19/10 20:07 by LarryDoyle. Date: 03/19/10 20:06 Re: Extra cylinder? Author: erneal4961 thank you very much!
Date: 03/21/10 21:44 Re: Extra cylinder? Author: patd3985 You are correct, sir! I learned of this while working on her in 89 at Fontana! I like 'em, as they seem to give her an extra big set of shoulders!
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