. Electric railway journal . Trench Subarade Seepage flews over A Btoward Trench track structure and paving materials. This trenchusually has a depth of from 15 in. to 21 in., dependingupon the depth of the rails and ballast, and it will beseen from Fig. 7 that the bottom of the trench maybe 9 in. below the bottom of a 6-in. macadam or othershallow pavement even at the gutter. With deeperpavements this depth becomes less, but even with a. Section Through Chairs

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