Within the main office building is located Selhurst traincrew depot, where many drivers and conductors are based. The depot has extensive stabling sidings, the three main groups of which are known as: Chalk, AC (which were so named because that was where the trains of the former AC system were stabled) and North. There is a large maintenance shed, an AC test rig (for dual voltage units equipped with pantographs), a train wash plant, and a cleaning shed. At the north-east corner of the site, near Norwood Junction station, is the smaller Norwood drivers' depot, and beside it the diesel fuelling point. Selhurst is unusual in that the maximum speed within the depot is 15 mph rather than the usual 5 mph, and signalled train movements are permissive.