. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . lettering on the faces of the posts. Ofcourse there must be a variation in the lettering or numberingand a special post must be cast for each location of division postor mile post. Whistle signs are made similarly except that there is but oneslab, suitably reinforced with ribs, and which faces in the desireddirection. The letter W 7| ins. high is cast in raised lettersnear the top. The ring sign is made similarly by
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . lettering on the faces of the posts. Ofcourse there must be a variation in the lettering or numberingand a special post must be cast for each location of division postor mile post. Whistle signs are made similarly except that there is but oneslab, suitably reinforced with ribs, and which faces in the desireddirection. The letter W 7| ins. high is cast in raised lettersnear the top. The ring sign is made similarly by using the letterR. The separating line between sections is indicated to thetrackmen by a cast-iron sign, called a section post, which is madesimilarly to the Trespass Signs, except that the tablet is muchsmaller. Such a sign will have two consecutive numbers, forexample, 24-25, to indicate that the sign is at the separatingline between section 24 and section 25. 375. Bridge warning. When possible the headroom beneathoverhead bridges is made at least 22 ft., which will make itsafe for a trainman to stand on the top of a freight car which is 398 RAILROAD CONSTRUCTION. § § 375. MISCELLANEOUS STRUCTURES AND BUILDINGS. 399 passing under the bridge, but it is not always possible to havethat amount of headroom. Under such circumstances, awarning for trainmen is necessary. These are made by sus-pending ticklers, which are a series of ropes spaced 6 which are suspended over the track at a sufficient distancefrom the bridge or tunnel so that the trainman shall have suffi-cient warning if he is struck by the dangling ropes. For asingle track road the tickler may be suspended from a horizontalarm fastened to a pole planted at least 10 ft. from the trackcenter, the arm being braced by a tie from the top of the poleand also by a short strut imderneath. When several tracks areto be spanned, two poles will be used and a catenary cable,between the tops of the poles, supports a
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Keywords: ., bookauthorwebbwalt, bookcentury1900, bookdecade1920, bookyear1922
