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Union Pacific Railroad
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Signal Maintenance,
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Inspection, Test and
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Standard Instructions
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Yellow Book
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Rev. 01/15/19
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The safety and reliability of our signal system demands proper maintenance and thorough testing. It is
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vital that these systems be installed, maintained, inspected, and tested in accordance with the Signal
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Maintenance, Inspection, Test and Standard Instructions and Standard Drawings. The purpose of these
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instructions is to verify the proper operation of our signal system. It is absolutely crucial that all
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problems be located and corrected before the system is placed in service. In addition, thorough testing
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is vital when a system is disarranged or modified, and at the specified time intervals to ensure these
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systems and equipment continue to operate as designed. There is absolutely no substitute for thorough
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installation, testing, inspection, and maintenance of signal apparatus.
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Union Pacific Signal Tests and Standards
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Copyright © Union Pacific Railroad 2019.
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Union Pacific Signal Tests and Standards Top
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ii
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Rev. 01/15/19
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Union Pacific Signal Tests and Standards
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Signal Maintenance, Inspection, Test and
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Standard Instructions
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Chapter 1 General Instructions ....................... 1-i
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Chapter 2 Switches............................................. 2-i
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Chapter 3 Emergency Procedures .................... 3-i
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Chapter 4 Locking and Interlocking Plants .. 4-i
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Chapter 5 Batteries ............................................. 5-i
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Chapter 6 Defect Detector ................................ 6-i
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Chapter 7 Signal and Enclosure ...................... 7-i
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Chapter 8 Crossings ........................................... 8-i
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Chapter 9 Track Circuits and Bonding .......... 9-i
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Chapter 10 Yards .............................................. 10-i
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Chapter 11 Relays ............................................. 11-i
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Chapter 12 Insulated Wires and Cables ....... 12-i
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Chapter 13 Other .............................................. 13-i
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Chapter 14 Testing Matrices .......................... 14-i
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Chapter 15 Forms .............................................. 15-i
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Union Pacific Signal Tests and Standards Top
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iii
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Rev. 01/15/19
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Union Pacific Signal Tests and Standards
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