In 1889 one of Holden's shunting tanks engines was fitted with the Westinghouse brake and evaluated on passenger working. The 1889 experiment resulted in eighty of these tanks, slightly larger than Class T18 and classified as GER Class R24, being turned out from 1890 to 1896. They took over the whole of the suburban working between Liverpool Street and Chingford, Enfield Town, and Palace Gates. Twenty shunters of the same type emerged in 1890 and 1891. In addition, in 1889 and 1893, Holden built twenty smaller 0-6-0 tanks (Class E22) with 14 in. by 20 in. cylinders and a weight of 36½ tons, for light branch work. Some of the latter worked for years between Fenchurch Street and Blackwall with part of their side rods removed, so converting them to the 2-4-0 wheel arrangement.