4-4-4

Other equivalent classifications are: A single, experimental 4-4-4, classified as S 2/6, was built for the Royal Bavarian State Railways in 1906 by Maffei.

It was fast, attaining 154 km/h (96 mph) on test, and was semi-streamlined with a pointed nosecone and fairings around the cylinders, stack and dome, and slanted-back cab windows.

In the Lady Baltimore's case the Abraham Lincoln on the Chicago and Alton Railroad, a wholly owned subsidiary of the B&O.

It was returned to the B&O and was again modified at the railroad's Mount Clare shops, a less streamlined cab and front end being fitted.

Subsequently, it was placed into local service on the railroad's Wheeling Division, mostly operating between Holloway and Cleveland, Ohio.

The F2a was styled after the Milwaukee Road "Hiawatha" 4-4-2 "Atlantic", but with a four-wheel trailing truck to support a longer firebox.

They can be most easily distinguished from the other type through the main rods being connected to the leading pair of drivers.

[1] In Britain the 4-4-4 arrangement was confined to tank locomotives and there to specific applications requiring either high speed stability in both directions (created by a symmetrical arrangement with bogies front and rear) or a powerful locomotive with as short a fixed wheelbase as possible.

[2] The Midland and South Western Junction Railway purchased two 4-4-4 tank engines from Sharp, Stewart and Company but these were not a success due to their poor traction.

[4] The H Class locomotives built for the Metropolitan Railway in the 1920s are an example of both these factors leading to a rare use of the 4-4-4 arrangement.

The Vishveshwaraiah Iron and Steel Company, Bhadravati introduced a Class-E 4-4-4 tank engine in March 1921.