The Avonside Engine Company offered a range of standard narrow gauge tank locomotives that could be ordered with various gauge and cylinder diameter combinations. In order to ensure a long service life and low wear, some assemblies were made of harder steel than actually required and the friction surfaces on wear-intensive parts were made wider.
A slightly larger type of locomotive with a 2-4-0T wheel arrangement is represented by the “India”. It was available in gauges of 3 feet, metre gauge and 3 feet 6 inches and intended for mixed traffic. The cylinder diameter could be chosen between ten and 17 inches.