Under the Whyte notation for the classification of steam locomotives, 4-8-0 represents the wheel arrangement of four leading wheels on two axles, usually in a leading truck or bogie, eight powered and coupled driving wheels on four axles and no trailing wheels.

The first example of this wheel arrangement was built in 1882 for the Central Pacific. They named it "Mastodon". Otherwise, these were called "Twelve Wheelers". On the Norfolk & Western, …

Nov 5, 2024 · One of the more unique wheel arrangements to be applied to a steam locomotive was the 4-8-0 twelve wheeler, also recognized as a Mastodon for one of the first railroads to operate it.

These were the last in a series of such engines for the Souther Pacific and they were big and featured the long stroke usually found on 4-8-0s. They were almost immediately converted to oil-firing.

The FE&MV ran from Fremont, Nebraska to Norfolk, on to Fort Robinson, then into the Black Hills. Although the prognosis for success of this design was quite positive, as it always was in these journals, very few if any 4-8-0s actually ran in US narrow-gauge service.

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Under the Whyte notation for the classification of steam locomotives, 4-8-0 represents the wheel arrangement of four leading wheels on two axles, usually in a leading truck, eight powered and coupled driving wheels on four axles, and no trailing wheels.