(F) 18" Porter Compressed Air Loco Chassis

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(F) 18" Porter Compressed Air Loco Chassis

Postby Geeky Gecko » Sat Dec 31, 2011 8:28 pm

Stefan

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Postby rockershovel » Tue Jan 03, 2012 11:24 am

I would have considerable reservations as to whether it was feasible to convert a compressed air loco to steam operation, as claimed in the advert.

I'm well aware that a steam loco can be made to turn for demonstration purposes on compressed air, but whether its internal geometry means it could actually do useful work that way, I doubt.

Has anyone actually converted a compressed air loco to steam? Does it work?
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Postby Trevor Coburn » Tue Jan 03, 2012 12:36 pm

If my memory serves correct, I think there was an article in the Narrow Gauge & Short Line Gazette back in the 80's. About some one who did just that. I can't recall where the boiler came from though.

But of course if you throw enough money at it anything is possible!
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Postby Les » Tue Jan 03, 2012 2:10 pm

I think it was a Homestake Mining Company 18" gauge 0-4-0 Compressed air loco, possibly by Porter. The guy turned it into a steam-powered miniature Forney. He was clearly an accomplished engineer!
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Postby Trevor Coburn » Tue Jan 03, 2012 6:54 pm

That's the one Les :D

I think it could have been in July / Aug 1989. See:

http://urbaneagle.com/slim/NGSLGplanlist.html
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Postby jefran » Tue Jan 03, 2012 9:04 pm

I think it could have been in July / Aug 1989?


It was - I have a copy in front of me now. The builder (the late Tommy Thompson) clearly knew what he was about, able to design an ASME coded (locomotive) boiler, which was built by the Seattle Boiler Works. As regards the cylinders, the only changes he actually made were to add drains (compresssed air doesn't condense!), and "drifting valves" (are these snifters?). [EDIT = yes]
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