Relay Systems of America specializes in locomotive contactor reliability upgrades, relay interface cabinets for microprocessor control system upgrades, and modernized, higher reliability general purpose relays. If you have a locomotive component reliability issue, we can investigate it and design an upgrade for you. We develop products to upgrade components on all major US locomotive manufacturers and are AAR M-1003 certified. All of our products have final assembly and testing at our plant in Joliet, Illinois. Visit our booth or website to see our current lineup of products.