Perth-based technology company DTI Group has won a $US7.2 million ($9.5 million) contract to install CCTV surveillance systems on light rail vehicles in the US over the next 18 months.

Perth-based technology company DTI Group has won a $US7.2 million ($9.5 million) contract to install CCTV surveillance systems on light rail vehicles in the US over the next 18 months.