Under the Whyte notation for the classification of steam locomotives, 2-4-0 represents the wheel arrangement of two leading wheels on one axle, four powered and coupled driving wheels on two axles and no trailing wheels. In most of North America it became known as a Porter.

Railroads that used 2-4-0 "Porter" Locomotives in the USA (data provided by Steve Llanso of Sweat House Media)

Between 1846 and 1880, the 2-4-0 was the standard type for passenger and mixed-traffic locomotives and was built in large numbers by, amongst others, the LNWR (1846–96), the Midland Railway (1846–1880), the Great Northern Railway (1849–97), the North Eastern Railway (1856–88) and the Great Eastern Railway (1856–1902).

Locomotives classified 2-4-0 under the Whyte notation of locomotive axle arrangements. The equivalent UIC classification of locomotive axle arrangements is 1B or 1'B.

6 天之前 · 2-4-0 (plural 2-4-0s) Under the Whyte notation system, a steam locomotive that has two leading wheels followed by two sets of coupled driving wheels, and no trailing wheels.

The March 2-4-0 was an experimental six-wheeled Formula One racing car built by the March Engineering company of Bicester, UK. It was constructed in late 1976 and tested in early 1977. The car followed on from the successful use by Tyrrell Racing of a six-wheeled car, the Tyrrell P34, in Formula One racing.

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2008年10月26日 · 这是有规律的：减2加4，减2加4……

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