Proprietary line of 3rd rail insulators and coverboard brackets for the transit market. The insulators isolate the electrified 3rd rail from the ground. The electrified rail supplies electrical energy to the transit cars. Major metro city transit authorities in cities that have subways and trains that operate with an electrified third rail as well as contractors that install and repair third rail systems. METRO authorities include LIRR, NYCTA, MBTA, CTA, PATH, MARTA, SEPTA, BART and others.