The Digitrax PM74 Power Manager can handle up to four Power Manager sub-districts. As an upgraded replacement for PM42 Quad Power Manager, it's a PM42, fully encased with fully connectorized installation. Each Power sub-district/detection section (DS) supports auto-reverse or short circuit management. Each DS supports occupancy detection and transponding detection. Allows mainline CV read/write program of compatible decoders. Also features remote LED status support and Series7 style advanced installation support using DT602.