International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 612
place all trestles on fig. cos. tangents. Circumstances, however, sometimes render thecurved trestle a necessity, in which case the outer postsrr^^f A ^1 Notch must have an increased rf batter and the outer rail its proper elevation. There are various meth-ods of elevating track oncurved trestles,… … ^N,
Railroad engineering
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