File:Railroad structures and estimates (1918) (14759122812).jpg

Identifier: railroadstructur00orro (find matches)
Title: Railroad structures and estimates
Year: 1918 (1910s)
Authors: Orrock, John Wilson, 1870-
Subjects: Railroads Railroads
Publisher: New York, Wiley
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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Text Appearing Before Image:
, if wooden signs are used they are soonshattered. , The signs in general use are made of cast iron, sheet steel,concrete, enamelled iron and wood, with concrete, steel or oldboiler tube and wooden posts. The wooden signs and posts,used almost exclusively, are, however, gradually disappearing,for work of this character, on account of the higher price oftimber, its short life and high maintenance cost. The desire also to get away from the everlasting painting ofsigns has led to a number of devices, such as concrete signswith the letters or numbers made in a black mixture, the castiron sign with the letters or numbers cast on them, and thepunched out sign where the letters or figures are punched outand daylight takes the place of paint. The punched out signs were introduced by the C. P. R. fortheir bridge and culvert numbers, whistle posts, mile plates andslow and stop signals, snow plow signs, section numbers, etc.,and a short description of each may be of interest: 298 TWO POST TOWER.
Text Appearing After Image:
SIDE ELEVATION END ELEVATION Fig. 112. N. P. Ry. Two-post Tower for Crossing Gates. BRIDGE NUMBERS. 299 Bridge Numbers. Fig. 114 shows the punched out sign now used in place of thewooden sign. For new bridges it is furnished with the bridgeand costs 75 cents; when replacing a wooden sign the cost is$1. There is practically no maintenance to this sign as it is apart of the bridge and is painted when the bridge is painted;there is no lettering and the little paint required to cover itwhen the bridge is-being painted is practically nothing. in 3i ■ J^Lag Screws 6 Ig. END VIEW T Note :-Qiie Number Plate on TVTile Post side of eachBridge about centre. When Bridge is over 500 ft.long place Number Plate at each end.AH plates painted same color as Bridge. For detail of punclied out figures see F-li-lSj Holes for j/lagscxesw

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