In 1929 the director, Arno Demmer, sent him to the USA, where he stayed until 1938, working on the New York Central Railroad testing a Kylala blastpipe.
In 1933, two locomotives (788 and 793) were fitted with Kylälä exhausts.
The Kylchap steam locomotive exhaust system was designed and patented by French steam engineer André Chapelon, using a second-stage nozzle designed by the Finnish engineer Kyösti Kylälä and known as the Kylälä spreader; thus the name KylChap for this design.
Later the French engineer André Chapelon, developed and improved the invention by using a second-stage nozzle and adopted the name Kylchap for this design.
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Kylchap exhausts are found on many French and British locomotives notably the Flying Scotsman and the world record holding Mallard.
(The Kylchap was named so due to the names of its creators, Kylälä and Chapelon.)