Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A booster engine for steam locomotives is a small two-cylinder steam engine back-gear-connected to the trailing truck axle on the locomotive or, if none, the lead truck on the tender. A rocking idler gear permits it to be put into operation by the engineer. It would drive one axle only and could be non- reversible with one idler gear or reversible with two idler gears.

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