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The Epflex® Railseal/Enclosure Combination System isolates the rail from the surrounding roadbed and provides numerous benefits for both the Transit Authority and the motoring public. Polycorp's design team can provide custom materials to fit any dimensional situation. Electrical isolation is accomplished with an inner liner of the boot while the bulk of the trough is filled with more commercially viable material. The result is the best of both worlds — a sophisticated system for rail isolation, track modulus control and access with an affordable price tag.