Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 671
rails andleaving them and to steady their lateral oscillations when approaching such points, guard-rails andwin^-rails are introduced. Wing-rails, so called for the reason that they are wings or branches ofthe°main rails, are indicated in the cut by the letter b ; guard-rails, a a, are separate… … tween them. If the intersecting parallelogram approaches the form of a square, the guard-railsare usually extended so as to form a closed parallelogram. Square crossings are the most difficultto maintain. Fig. 3589 represents a bolted steel-rail crossing made by the Pennsylvania Steel Company of…
Mechanical engineering -- Dictionaries
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