High Quality Content by WIKIPEDIA articles! The Class A1 locomotives were rebuilds of the Class A "Heavy Compounds" that had been designed by the BNCR Locomotive Engineer Bowman Malcolm. The first Class A locomotive had been built by the BNCR at York Road, Belfast in 1901 shortly before amalagamation with the Midland Railway and building continued with the Midland Railway constructing six at their Derby works. The locomotives were built as two-cylinder compounds using the Worsdell-von Borries system, the high pressure cylinders having a diameter of 18 inches (457 mm) and low pressure ones of 26 inches (660 mm), both with 24 inches (610 mm) stroke.

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