. Electric railway journal . shland HalstedSt Racine Ave 35th St Archer Ave HalstedSt Lake St 63rd PI 69th St 39th 67th St 63rd St 55th St 51st St 12th St Monroe St Miles ofStreet 26th Type ofTrack,No. 3333333333 33333 3 YearLaid Condition 1908 None 1910 None 1909 None 1911 None 1914 None 1913 None 1911 Slight 1912 None 1911 Trace 1913 Trace 1909 Slight None 1909 None 1912 Trace 1912 None 1913 Slight 1911 Corrugated Slight 1910 Trace 1914 Corrugated
. Electric railway journal . shland HalstedSt Racine Ave 35th St Archer Ave HalstedSt Lake St 63rd PI 69th St 39th 67th St 63rd St 55th St 51st St 12th St Monroe St Miles ofStreet 26th Type ofTrack,No. 3333333333 33333 3 YearLaid Condition 1908 None 1910 None 1909 None 1911 None 1914 None 1913 None 1911 Slight 1912 None 1911 Trace 1913 Trace 1909 Slight None 1909 None 1912 Trace 1912 None 1913 Slight 1911 Corrugated Slight 1910 Trace 1914 Corrugated 1913 None 1908 None 1909 Trace 1908 Trace 1908 Slight 1907 Slight 1911 SUMMARY SUMMARY Miles of Street Condition Per Cent Miles of Street Condition Per Cent None1 Trace Either continuous or in spotsj Slight [ Corrugated , Either continuous or in spots NoneTraceSlightCorrugated Total. 18 0 Total. 1014 ELECTRIC RAILWAY JOURNAL [Vol. XLVIII, No. 20. CHICAGO TRACK STUDIES—FIGS. 1, 2 AND 3, CORRUGATED RAILS is held in place by screw spikes. The Chicago rail isa 9-in. section which is laid in 60-ft. lengths withLorain electrically-welded joints. Tie rods, 2 in. x 5/16in. x 5 ft. in size, spaced at 6-ft. intervals and inserted5Ys in. above the rail base, hold the rail to gage. An examination of the data given as a result of thisinvestigation for the amount and character of rail cor-rugation also reveals the fact that this phenomenon isnot a respecter of age or conditions. For instance,much of the oldest track shows no indication of corru-gation, whereas on some of that constructed muchlater corrugations of a maximum wave length anddepth have appeared. It will also be noted that whilethere is more track of the ballasted type of constructionhaving no corrugation than there is of track laid onconcrete foundation, yet there is only per cent ofthe ballasted track showing a trace of corrugation,whereas the
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