940         EQUIPMENT MAINTENANCE, REPAIR, AND CONSTRUCTION SERVICES - RAILROAD
94054  *    Power Supply Installation, Electric
94055  *    Power Supply Maintenance and Repair, Electric
94063  *    Rail Grinding
94075  *    Signal System Installation
94076  *    Signal System Maintenance and Repair
94085  *    Tower Construction
94086  *    Tower Maintenance and Repair
94088  *    Track Construction and Inspection
94089  *    Track Maintenance and Repair
94092  *    Weed/Brush Control Services