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