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Part 233      Signal Reporting Requirements

Part 234      Grade Crossing Signal System Safety

Part 235      Instructions Governing Applications for Approval of a Discontinuance or Material
                   Modification of a Signal System or Relief from the Requirements of Part 236

Part 236     Rules, Standards and Instructions Governing the Installation, Inspection, Maintenance
                   and Repair of Systems, Devices and Appliances

                  Part 236 Subparts A and B

                  Part 236 Subparts C, D, E and F

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