This animated CAD model was graciously constructed by Chris Rueby, a Modeler and Artist With Many Interests!

See some of his amazing work here: www.craftsmanshipmuseum.com/artisan/chris-rueby/

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This animation closely represents the functional operation for the three steam cylinders on the GCWW engines with the exception that Corliss valves are used on the first three steam ports. The water pumps operate somewhat differently and you can see that in part 2 of the GCWW video. Animation courtesy Kempton Steam Museum, London, UK

Video animation to illustrate operation of the Allis Triple-expansion steam pump
at Chestnut Hill Pumping Station, Boston Mass. by: John P Maggard ~ Illustrator

Video animation to illustrate operation of the Leavitt Triple-expansion steam pump
at Chestnut Hill Pumping Station, Boston Mass. by: John P Maggard ~ Illustrator