. Railroad structures and estimates . , 135 lb. See Fig. 52a. Another type of rail section that has developed within the pastyear or two is the so-called frictionless rail, designed to reducethe frictional resistance and wear between the rail and the wheel HEAVY RAIL SECTIONS. 185 flanges on curves. It has a deep narrow head with sloping sides,the base remaining the same as in the ordinary rail; it is beingtried out by a number of railroads. DESIGN OF RECENT HEAVY RAIL SECTIONS. Fig. m^H^ Railway Lehigh Valley R. R. Pennsylvania R. R. Central R. R. of New Jersey Weight 136 1b. 125 1b. 13
. Railroad structures and estimates . , 135 lb. See Fig. 52a. Another type of rail section that has developed within the pastyear or two is the so-called frictionless rail, designed to reducethe frictional resistance and wear between the rail and the wheel HEAVY RAIL SECTIONS. 185 flanges on curves. It has a deep narrow head with sloping sides,the base remaining the same as in the ordinary rail; it is beingtried out by a number of railroads. DESIGN OF RECENT HEAVY RAIL SECTIONS. Fig. m^H^ Railway Lehigh Valley R. R. Pennsylvania R. R. Central R. R. of New Jersey Weight 136 1b. 125 1b. 1351b. Height 7 in. 6| in. 6| in. Head , sq. in. , sq. in. Web , sq. in. , sq. in. Base , sq. in. , sq. in. ^% Total. . . , sq. in. , sq. in. Moment of inertia. It is recognized that the margin of safety in regard to rails isquite small; for this reason the heavier the rail section, otherthings being equal, the better will be the service and the moreeconomical it will be in maintenance and operation. The tonnage rolled of the A. R. E. A. rail series A and B have beenfairly successful in service under favorable conditions. It is statedthat these sections can be rolled in the mill at a lower temperaturethan the ordinary A. S. C. E. rail and that therefore a finer grainand better weaving surface is secured. 186 PRODUCTION OF RAILS. The following figures giv
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