Steam Locomotive

Full Definition

Steam locomotives use coal, oil, or wood to heat water in a boiler, creating steam that drives pistons connected to the driving wheels. Classified by wheel arrangement (e.g., 4-6-2 Pacific, 4-8-4 Northern), steam engines dominated railroading until the mid-20th century. Model steam locomotives are prized for their detail and drama but are generally more expensive than diesels.

Examples

• •A 4-6-2 Pacific has 4 pilot wheels, 6 drivers, and 2 trailing wheels

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