. Railroad structures and estimates . Fig. 77. TT =3@E -3 - •.••11 ::3J -fcp SAND CAR STOP Fig. 78. 234 STEEL BUMPING POST. Steel Bumping Post, D. L. & W. R. R. (Fig. 79.) — It isbuilt entirely of structural steel shapes and rests on a concretebed to which it is securely anchored by twenty l|-in. bottom ties are 15-in. 55-lb. channels about 15 ft. 6 bedded in concrete laid over the foundation. These aresaid to provide a stable base, and the upright bracket whichcarries the rubber bumper block is strongly reinforced withstiffening angles in the direction of the resultant force
. Railroad structures and estimates . Fig. 77. TT =3@E -3 - •.••11 ::3J -fcp SAND CAR STOP Fig. 78. 234 STEEL BUMPING POST. Steel Bumping Post, D. L. & W. R. R. (Fig. 79.) — It isbuilt entirely of structural steel shapes and rests on a concretebed to which it is securely anchored by twenty l|-in. bottom ties are 15-in. 55-lb. channels about 15 ft. 6 bedded in concrete laid over the foundation. These aresaid to provide a stable base, and the upright bracket whichcarries the rubber bumper block is strongly reinforced withstiffening angles in the direction of the resultant forces Fig. 79. Details of Steel Bumping Post in Hoboken Terminal of D. L. &W. R. R. DIAMOND CROSSINGS. 235 Diamonds. — The present day crossings, where traffic amountsto anjlhing, are usually made of manganese steel, cast in two ormore pieces. Where traffic is very light, built-up rail crossingsof heavy steel are quite common. It is well known that the pounding of roUing stock over acrossing is very destructive and if any looseness develops inany part of the cros^sing it is soon rendered unfit for is essential, therefore, that the crossing be made of as fewparts as possible, that the rails are deep and stiff and the con-nections made rigid so that no looseness shall develop underordinary care and wea^^. Standards for manganese crossings of various types for vary-ing conditions and angles have been developed by the manga-nese track society which are followed pretty closely by thevarious manufacturers. It is usual for the railway, in manganese work, to contractfor their cross
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