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Q11548
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Which is the combination of rails, sleepers, ballast and subgrade ?
Q11549
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Which is the minimum distance between the running faces of the two rails ?
Q11550
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Which is the subgrade prepared to relieve the ballast ?
Q11551
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What is the distance between the running faces of broad gauge ?
Q11552
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Which is the first engineerring survey for laying a new railway line ?