International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 295
is form of cattle guard. It is quickly and cheaplymade and thoroughly efficient. 1466. Open Passage W^ays.—These are passageways for public roads which cross the railroad below grade.The walls in part serve the purpose of retaining walls, andshould have a thickness at their base of about y*^- of… … The steps CD, etc.,are so arranged thatthe natural slope E Fof the embankmentwill just touch theback of the steps.The steps are not car-ried down to the levelof the ground, butstop at G where thewall has a height be-tween 4 and 5 feet.The section shows thethickness of the walls,w h i c h are 2^…
Railroad engineering
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