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NER 66 Aerolite is an example of a 2-2-4 locomotive. In Whyte notation, a 2-2-4T is a steam locomotive that has two leading wheels followed by two coupled driving wheels and four trailing wheels. This was an unusual wheel arrangement, only used on a few specialised locomotives. This wheel arrangement is only used for tank locomotives.
The T. D. Judah locomotive was built as a 4-2-4 by the Cooke Locomotive and Machine Works in 1863. It was purchased for use on the Central Pacific Railroad and was rebuilt as a 4-2-2 in 1872. By 1900, typical loads on express trains had grown beyond the capabilities of 4-2-2 locomotives and the configuration was superseded by the 4-4-2.