CMI-PROMEX, INC. is a full-service machine shop that specializes in manufacturing specialty railroad track. Our core products include the Ridex miter rail system for movable railway bridges and rail expansion joints for both movable and fixed bridges. Our bridge joint products have been installed on over 500 bridges for Class I railroads and Transits. Additional capabilities include rail curving, rail machining, custom tie plates, ProLite signal housings and crane rail expansion joints.