. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . 298 RAILROAD CONSTRUCIION. §267. expensive to build and maintain. It is the standard form oftrack in England and some parts of Europe. Until after 1893 there was a very great multiplicity in thedesigns of T rails as used in this country, nearly everyprominent railroad having its own special design, which perhapsdiffered from that of some other road by only a very minute andinsignificant detail, but which nevertheless would require acomplete new set of rolls for rolling. This ha
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . 298 RAILROAD CONSTRUCIION. §267. expensive to build and maintain. It is the standard form oftrack in England and some parts of Europe. Until after 1893 there was a very great multiplicity in thedesigns of T rails as used in this country, nearly everyprominent railroad having its own special design, which perhapsdiffered from that of some other road by only a very minute andinsignificant detail, but which nevertheless would require acomplete new set of rolls for rolling. This had a very appreciableeffect on the cost of rails. In 1893, the American Society ofCivil Engineers, after a very exhaustive investigation of the. Fig. 117.—Standard Rail Sections. subject, extending over several years, having obtained the opin-ions of the best experts of the country, adopted a series of sec-tions which have been very extensively adopted by the railroadsof this country. In 1909 the American Railway Association and the AmericanRailway Engineering Association, by combined action, developeda series of sections. Fig. 117 shows diagrammatically all ofthese sections and their variations with different weights andsystems are shown by the tabular values for the lettered dimen-sions. It may be noted that the radii of the upper and lowercorners of the flanges and of the lower corners of the head areconstant ire) for all weights of rail and for all systems. §267. RAILS. 299 s■§ OQ .2 G CD s 5^ 00(M(M(N(N (N (m (m CO l> LO .-1 o oC0»O00Ols wi^!5lSl^*|S:S|S mxx ^^^^^ fe. (M(M(M(MCO (M(N(NCOCO 1 (M{M(N<M(M CO CO CO cq 513:1Sh«S^S:4« r-l
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