Problem A railroad service customer in Baltimore, Maryland contacted URETEK with a suspected erosion problem. Surface observations indicated that voids were present below a 32-inch concrete railway substructure. The voids were likely the result of erosion by a constant flow of drainage water collecting beneath the ballast substructure. With heavy daily usage on this important railway, an extended amount of downtime was not a viable option. Additionally, issues related to accessibility and track geometry were also major concerns for the railway operator. Analysis Voids below the railbed were initially estimated by the customer to be as deep as 12 inches, stretching over several hundred feet of track. A differential in elevation was easily observable, and displacement of large qu

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