. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools . on of the valve and to the devicefor holding the arm parallel to the track when not in use so thatit will not be struck by a passing train. When a stand pipe islocated between parallel tracks, the strict requirements of clear-ance demand that the tracks shall be bowled outward the tracks were originally straight, they may be shoved over bythe trackmen, the shifting gradually running out at about 100feet each side of the stand-pipe. If the tracks were originallycurved
. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools . on of the valve and to the devicefor holding the arm parallel to the track when not in use so thatit will not be struck by a passing train. When a stand pipe islocated between parallel tracks, the strict requirements of clear-ance demand that the tracks shall be bowled outward the tracks were originally straight, they may be shoved over bythe trackmen, the shifting gradually running out at about 100feet each side of the stand-pipe. If the tracks were originallycurved, a slight change in radius will suffice to give the necessaryextra distance betw^een the tracks. BUILDINGS. 286. Station platforms. These are most commonly made ofplanks at minor stations. Concrete is used in better-class work,also paving brick. An estimate of the cost of a platform of pavingbrick laid at Topeka, Kan., was $ per 100 square feet when 332 RAILROAD CONSTRUCTION. §286. laid flat and $ per 100 square feet when laid on edge. Thecurbmg cost 36 cents per Hnear foot. Cinders, curbed by timbers. Fig. 161.— stone, bound by iron rods, make a cheap and fairly durableplatform, but in wet weather the cinders will be tracked into § 287. MISCELLANEOUS STRUCTURES AND BUILDINGS. 333 the stations and cars. Three inches of crushed stone on acinder foundation is considered to be still better, after it is oncethoroughly packed, than a cinder surface. Elevation.—The elevation of the platform with respect tothe rail has long been a fruitful source of discussion. Some roadsmake the platforms on a level with the top of the rail, others3 above, others still higher. As a matter of convenience tothe passengers, the majority find it easier to enter the car froma high platform, but experience proves that accidents are morenumerous with the higher platforms, unless steps are discardedaltogether and the cars are entered from level platforms, as isdone on elevated roa
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