. Railway track and track work . is mainlyrelied on, but a careful man will assist his sight by means of a sightingrod or target. For short sights, as in bent rails, he should bring his eyeclose to the rail, but for longer sights he should stand up at some distancefrom the work, so as to avoid putting a swing in the track. He may sightby means of a rod or target fitted to a track level or gage, a graduated arcon the gage giving the vertical setting of the rod. The target is screwedinto the top of the gage, with its center line directly over the gage side ofthe rail. In all work of this kind, o
. Railway track and track work . is mainlyrelied on, but a careful man will assist his sight by means of a sightingrod or target. For short sights, as in bent rails, he should bring his eyeclose to the rail, but for longer sights he should stand up at some distancefrom the work, so as to avoid putting a swing in the track. He may sightby means of a rod or target fitted to a track level or gage, a graduated arcon the gage giving the vertical setting of the rod. The target is screwedinto the top of the gage, with its center line directly over the gage side ofthe rail. In all work of this kind, one line of rail is taken as the line rail,and all lining is done on it, the other rail being conformed to the line thusgiven in the subsequent operation of gaging. After proceeding ahead forsome distance the foreman should turn and sight back as a check upon theaccuracy of his work. Bad swings, should be lined in by a transit.* With sights of 1 to 5 miles,as on long tangents, the center line may be sighted from the transit upon. y* I Fig. 205.—Track Target for Lining Curves. a foresight target 36 x 18 ins., painted red and white, and placed over thetrack at a water tank, etc., at a sufficient height to clear trains. Centerstakes and tacks may then be put at intervals of about 750 ft. (or oppositeevery fifth telegraph pole). The transit is then placed over the gage sideof the line rail at the starting point, and a foresight taken on a rod set atthe gage side of the rail and attached to a track gage, whose center line isover the center tack of one of the stakes. Intermediate sighting is thendone on a small target on a second track gage, which is moved along about50 ft. at a time. A lining gang for this work would consist of about threemen ahead of and five behind the moving target. A useful backsight tar-get to expedite transit work in lining curves, etc., in maintenance-of-way,is shown in Fig. 205. It is driven into the stake or tie just back of thetack marking a point, and it
Size: 1278px × 1955px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
