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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.
Eight 4-2-4 well- and back-tank locomotives which entered service on the Bristol and Exeter Railway in 1853 appear to have been the first with this wheel arrangement. The engine was designed by James Pearson , the railway company's engineer, and featured single large flangeless driving wheels between two supporting four-wheeled bogies .