224 RAILROAD LOCATION 



ESTIMATE OF COST A & B RAILROAD 



Clearing 625 A. at $20 per A $ 12,500 



Earth excavation: 900,000 cu. yd. at 17c 153,000 



Loose-rock excavation : 300,000 cu. yd. at 40c 120,000 



Solid-rock excavation: 200,000 cu. yd. at 80c 160,000 



Overhaul exceeding 600 ft. : 300,000 cu. yd. at Ic. 3,000 



Borrowed embankment: 80,000 cu. yd. at 17c. . . . 13,600 



Piling: 12,000 lin. ft. at 25c 3,000 



Framed trestles: 300,000 ft. B. M. at $35 per M. . 10,500 



First-class masonry: 2,800 cu. yd. at $12 33,600 



Second-class masonry: 4,200 cu. yd. at $8 33,600 



Box culvert masonry: 2,300 cu. yd. at $5 11,500 



Dry-rubble masonry: 2,600 cu. yd. at $4 10.400 



Concrete masonry: 3,000 cu. yd. at $6 18,000 



Riprap: 2,000sq. yd. at $1.50 3.000 



Cast-iron pipe culverts: 40,000 Ib. at 3c 1,200 



Vitrified pipe culverts: 1,800 lin. ft. at $1.50 2,700 



Total, exclusive of bridges and track $589,600 



Add 10 per cent 58,960 



Total cost for grading and trestles $648,560 



LOCATION 



The location is the operation of fitting the line to the ground 

 in such a manner as to secure the best adjustment of the aline- 

 ment and grade, consistent with an economical cost of construc- 

 tion. If no topographic map is available, the work of location 

 is done directly on the ground. Ordinarily, however, a topo- 

 graphic party is employed in the preliminary survey and a 

 contour map prepared. The location is then best projected on 

 the map, and it is called a paper location. 



An example of such location is illustrated in Fig. 1. Here, 

 the line follows the valley of Bear River, and the gradient is 

 determined by the slope of the stream. The gradient adopted 

 is .5%, or .5 ft. per station. The preliminary line is shown 

 dotted, and the located line is drawn full. 



Let the grade elevation for Sta. 16 be 155 ft.; the grade 

 elevation for Sta. 17 will, therefore, be 155 ft. + .5 ft. = 155.5 ft. 



