Simplified Curve And Switch Work a Span Classsearchtermspan Classsearc

Cover Simplified Curve And Switch Work a Span Classsearchtermspan Classsearc
Simplified Curve And Switch Work a Span Classsearchtermspan Classsearc
Walter F Walter Freeman Rench
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15. THE ADVANTAGE AND COST OF SPIRALING CURVES.
Early Location Made Without Easements It was universally the practice in the early days of railroads, as it very generally is today, to locate a line as a succession of tangents with no provision for present or future easements. Although opera- tion is possible over such an alinement it must nec- essarily be at a very moderate speed, and even then accidents are of not infrequent occurrence. While locomotives were small and the greatest speed attai
...nable was comparatively slow, the lack of easements for the lighter curves was not felt; but their absence from the sharper curves was al- ways a source of trouble. Indeed, it is difficult to conceive how operation was otherwise than pre- carious upon many such curves that were devoid of easements. The presence of superelevation pre- 74 THE SPIRAL supposes curvature and the very fact of a tangent track being several inches out of level, whether at the approach to a curve or elsewhere, suggests the possibility of accident.

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