A total of 182 units were built, numbered 158701—872 and 158901—910. The majority of units were built as two-car sets, with individual carriages numbered 52701—872/901—910 and 57701-872/901-910. Seventeen units (158798—814) were built as three-car units, with the centre carriages numbered 58701—717 - eight of these units have since had the centre car removed, while another eight have been upgraded to be Class 159s. The final ten units (158901—910) were built specifically for West Yorkshire PTE Metro services around Leeds.
There were three varieties of unit when built. The standard batch, two- and three-car units (158701—158814 and 158901—158910) had Cummins engines. The next batch (158815—158862) were built as non-standard to enable Perkins engines to be fitted. The final batch (158863—158872) were given higher-powered Cummins engines of as it was originally intended that these units would work the... Read More