Sep 15, 2016 · pipe under CSXT owned track shall be ASTM C-76, Class V, with “O” ring joints. Corrugated metal pipe under CSXT owned track shall be steel fiber bonded and asphalt coatedor steel polymer precoated , with minimum 24Perfect Steerable Transfer Carth wide connecting bands. The minimum recommended diameter of pipe under CSXT owned track is 36 Perfect Steerable Transfer Carthes.