This brake van had a particularly long history. It began life as 6-wheeled ABC class composite carriage number 4 in 1881. It was reclassified AH in 1900 and acquired 5'-6" wheelbase bogies in 1906-7. In April 1927 it was rebuilt as Z10615 in a similar style to Z185 later Z20, the rebuilt BC185. It was only 32'-0" long compared with the 33'-4" of Z185 but was otherwise similar with an end platform. It career was brought to an abrupt end by a collision and it was written off in October 1950.

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