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[quote]QUOTE: Originally posted by Alco GE On a 'Real' Two Cylinder Steam Locomotive the Right Crank Pin-Main Rod-Crosshead-Piston Leads the Left by Ninety 90 Degrees Going Forward. In Basic Terms, this gives Four 4 Equally Spaced 'Chuffs' per Revolution of the Driving Wheels, Two Exhausts per Cylinder, 90 Degrees of Wheel Rotation apart. Use an Internet Search Engine entering words 'Steam Locomotive' and search for Diagrams, etc. [/quote] Good explanation about the right leading the left, but there are exceptions. If you visit the Pennsylvania Railroad Muesum, you wil find all of the PRR engines have a left lead. The PRR was not the only one that used the left lead, but I cannot name the other road. None of the model engines that I have of the PRR are correct for the left lead. If you have a three cylinder, you have still another set of rules, since 360 is divided by 6, the lead of those engines is 60 degrees, and not 90. Just some facts that are interesting.
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