Here is a clip of the Roundhouse Twin-exhaust Chuffer fitted to a Roundhouse Darjeeling B by Dave Mees
Here is volunteer Chuffer-tester Jack Damrath's report on Ruby 2 from Colorado USA on 17th August:
"Chuffer arrived this am. Installed in less than one minute - including removal of factory pipe!
Two runs on the elevated RWY - results excellent!! A three car, heavy mixed passenger/freight consist.100 feet away the chuff was very,very audible. I agree with other reports that an impressive chuff is produced with a heavy load and low speed. A fine chuff for such a small locomotive like the Ruby 2.
Conditions were -- cloudless sky, light wind - under 10 mph., 60deg. F and humidity 38% so that a decent plume of steam was visible.
A highly impressive addition to our locomotives. I recommend it without reservation--AAA rated.
Jack's first Youtube effort is shown below - complete with a brief "trip" at the end!
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