McKenzie Valve & Machining Company manufactures a variety of carbon steel and stainless steel valves and flanges, primarily for application to railroad tank cars. The company is based in a 40,400-square-foot facility in McKenzie, Tenn. McKenzie originally began as a division of Union Tank Car Company, a Chicago-based designer, builder and lessor of specialized rail cars. McKenzie Valve & Machining Company and UTC are subsidiaries of The Marmon Group, an international association of more than 100 companies that operate independently within diverse business sectors. Based in Chicago, Marmon provides consulting and administrative services, including tax and accounting services, legal counsel and management consulting, to its member companies.