Many transit agencies' conductor insulation systems used for traction power cables and lower voltage power distribution and signal communication systems typically have a 30-year lifespan, and many of these systems are at that age or older.
TCRP Research Report 246: Transit Traction Power Cables: Replacement Guidelines, from TRB's Transit Cooperative Research Program, presents current practices for assessing insulation aging and replacement of cables before failure, including approaches used in transit systems for which there are no monitoring programs or testing systems.
National Academies of Sciences, Engineering, and Medicine. 2024. Transit Traction Power Cables: Replacement Guidelines. Washington, DC: The National Academies Press.
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