ADT sister company ART is certified to repair to manufacturers specifications a range of relay racks and modules originally manufactured by Leach International. ART has specialist simulation equipment designed to test and report on relay module function. The simulator is a critical system used to identify faults and assist in confirming the condition and working operation of the module and individual components. ART has highly experienced engineers and technicians providing support to local maintenance programs conducted by the major rolling stock operators and is offering this capability to the Defence sector.