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This article presents the fundamentals of stray-current corrosion caused by electric rail transit systems. It describes the various corrosion-control design elements for the electric rail system. These design elements include substation spacing and grounding, track and track slab design, and construction acceptance criteria. The impacts of the electric rail construction in underground utilities are discussed. Direct physical interferences, maintenance access encroachments, stray-current effects, and utility relocation design considerations, are discussed. The article also reviews construction issues such as funding, sequencing, and working clearances. It concludes with information on the post-construction monitoring and maintenance for stray-current corrosion control.

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