DENVER (CBS4) - Three men are now suspected of installing devices at light-rail ticketing machines that steal consumers credit card information.  The devices, called skimmers, were discovered before they could transmit any information. Investigators said nobodys information was compromised.  Surveillance video shows two men who may have installed the devices into ticketing machines at the Mineral station in the south metro area. The devices were also found on ticket machines at the Dry Creek and County Line stops.;