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  | Steam locomotive family tree |  |
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Steam locomotive family tree |
 A genealogy tracing 130 years of steam locomotive evolution
by Neil Carlson
During its 130-year life span, the American steam locomotive evolved from a frail machine capable of pulling only a handful of cars to a steel behemoth that could haul freight trains of 10,000 tons or more.
WP&Y 4-6-0 and NP 4-8-4

White Pass & Yukon 4-6-0 No. 10, built by Baldwin for the East Tennessee & Western North Carolina in 1910, poses next to newly shopped Northern Pacific 4-8-4 No. 2603, an Alco product from 1926. The two were photographed at NP’s shops in South Tacoma, Wash., in 1942.
Hack Miller
The great advances made in steam locomotive technology were driven by the economic needs of the country. Industrial expansion and population growth required heavier and faster trains, which required yet larger and more powerful locomotives. The locomotive industry met the railroads’ demand for more power by inventing tools to boost an engine’s power and efficiency, and by creatively introducing new locomotive wheel arrangements that improved on existing designs.
For example, as passenger train schedules were tightened in the 1920s, the railroads needed a more powerful 4-6-2 — the prevailing passenger locomotive type. But a more powerful 4-6-2 required a much larger firebox. So to support it, a four-wheel trailing truck was incorporated, thereby creating a new wheel arrangement, the 4-6-4. Each decade saw the introduction of locomotives that set new records in size and power. The accompanying steam locomotive family tree will give you an appreciation of how this evolution took place.
If you’ve ever wondered why there were both 4-8-2s and 4-8-4s doing the same job, take a look. If you’re looking for information on the uses, strengths, and inefficiencies of different steam locomotives, it’s here.
Clicking on the locomotive wheel arrangement will take you to a page that tells that engine’s story.
News-Source: http://www.modelrailroader.com
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| | Thanks for the story and links patto.. Very interesting.. |
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| can NOT find the rest of this story ie. the accompanying steam locomotive family tree chart. Please help!
Thanks
Soo |
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