. American engineer and railroad journal . may not only be built ne-v in any ordinary rail-road shop, but that it may be repaired with equal facility. The four longitudinal sills are 12-in. channels, the centersills being trussed with 1%-in. rods between the bolsters. stresses and the severe buffing stresses it was considereddesirable to neglect a small possible saving in weight in favorof strength. The suggestion of trussing a steel underframeseems a little out of the ordinary at this time. There is nodoubt, however, that this is a cheaper and lighter construc-tion than one of equal strength
. American engineer and railroad journal . may not only be built ne-v in any ordinary rail-road shop, but that it may be repaired with equal facility. The four longitudinal sills are 12-in. channels, the centersills being trussed with 1%-in. rods between the bolsters. stresses and the severe buffing stresses it was considereddesirable to neglect a small possible saving in weight in favorof strength. The suggestion of trussing a steel underframeseems a little out of the ordinary at this time. There is nodoubt, however, that this is a cheaper and lighter construc-tion than one of equal strength made ol rolled sections with-out the trussing, and with larger sills it would be difficultto secure the standard inside height. With this constructionthe height over the trucks is practically the same as itwould be with pressed steel sills of the fish-bellied form. Attention is directed to the gussets at the ends of the sills,which are flanged up to form shoulders for the subsills, tosecure the end frame from being pushed out by the THIRTV-TON BOX CAR. WITH STEEL UNDERFRAME. AMERICAN RAILWAY ASSOCIATION STANDARD DIMENSIONS. DESIGNED BY GEORGE I. KING. The body bolsters are of 12 x i/i-in. plates with 5 x for the side bearings. Unique attachments of the bodybolsters to the center sills and the truss rods to the bodybolsters are shown. Two truss rods are used and they arelocated near the center sills, where they will not interferewith the curving of the trucks or cause any inconveniencewith the side clearances of the car. The truss rods were used because in the opinion of thedesigner the stresses in the center sills would be undulygreat in a combination of severe buffing shocks or locomo-tive jerks with the direct stresses arising from the load inthe car. It was considered wise to support the sills withthese rods. For nearly vertical stresses channels lighterthan 12 ins. could have been used, but for the combination The enu sill is a ^-in. plate bent into >.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
