Translations:AY Honors/Model Railroad/Answer Key/56/en

A New York 2-6-6 Locomotive

A Central Sucre 2-4-0 Locomotive

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Standard Class 9F 2-10-0 Locomotive

Steam locomotives are described most commonly by how many wheels they have in each of three sections. The most notable set of wheels are the drive wheels which are usually larger and are connected by the rods which power them. The other two sets of wheels are both smaller and lie ahead of and behind the central drive wheels. Since there are at most three sets of wheels, a locomotive classification will have three numbers separated by dashes. If a locomotive has only drive wheels, the first and last numbers will still appear, but will both be zero. This classification system counts all the wheels (both sides) so when looking at the side of a locomotive, remember to multiply what you see by two.