. Railroad structures and estimates . Tjettered on both sides Fig. 107. Highway Crossing Signand Alarm Bell. Track Battery [. Typical Circuit for Single Track. —For automatic operation by train,track circuit shall be operated bygravity or caustic soda cells onclosed circuit; current shall enterthe track at the extreme ends ofcircuits. Bell ceases ringing when lastwheels pass crossing. CUOSSINC. r,.\T]: •J!) I Safety Crossing Gates. — At pulilir man L;ia(ic ciossinir^ n i^somctiines nooessarv to place safety gates, consisting of ironposts placed at the curb of roaihvay parallel with track to wh
. Railroad structures and estimates . Tjettered on both sides Fig. 107. Highway Crossing Signand Alarm Bell. Track Battery [. Typical Circuit for Single Track. —For automatic operation by train,track circuit shall be operated bygravity or caustic soda cells onclosed circuit; current shall enterthe track at the extreme ends ofcircuits. Bell ceases ringing when lastwheels pass crossing. CUOSSINC. r,.\T]: •J!) I Safety Crossing Gates. — At pulilir man L;ia(ic ciossinir^ n i^somctiines nooessarv to place safety gates, consisting of ironposts placed at the curb of roaihvay parallel with track to whichare connectetl the main and sidewalk arms, usually of wood,that stretch over antl protect the crossing They are operatedby hand crank at gate level, or by hantl lever or compressed airfrom a tower (sometimes a number of crossings are operatedfrom the one tower), arrangetl so that the gates cannot be openedor closed excepting by the operator. The connections for oper-ating the gates simultaneously are cither placed undergroundor overhead as desired. The gates are usually located 8 to 10 ft. clear of the nearestr
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Keywords: ., bookcentury1900, bookdecade1910, bookidrailroadstructur00orrouof
