. American engineer and railroad journal . anscovered by semiparabolic trusses, resembling the Linvillesysiein, 350 ft. long. These great iron bridges are designed only over theTobol (1,400 ft. clear length), over the Ishim (700 ft. clearlength), and over the Tomi River. Besides these on the division between Chelabinsk andthe Obi River there are designed one wooden bridge of140 It. span over the Chik River ; 335 small woodenbridges of spans from 14 to 105 ft. ; three stone culverts of7 ft. span, one culvert of loi ft. span, and 10 cast-iron pipeculverts of 2i t- diameter. On the other or easte
. American engineer and railroad journal . anscovered by semiparabolic trusses, resembling the Linvillesysiein, 350 ft. long. These great iron bridges are designed only over theTobol (1,400 ft. clear length), over the Ishim (700 ft. clearlength), and over the Tomi River. Besides these on the division between Chelabinsk andthe Obi River there are designed one wooden bridge of140 It. span over the Chik River ; 335 small woodenbridges of spans from 14 to 105 ft. ; three stone culverts of7 ft. span, one culvert of loi ft. span, and 10 cast-iron pipeculverts of 2i t- diameter. On the other or eastern side of the Obi River Ihe spansat a number of small rivers are not yet fixed. The Irtish and the Obi rivers, rei|uiring bridges and 2,800 ft. clear length, will be provisionallycrossed by steam ferries. As noted above, the thickness ol ballast is to be 12^ in.,which requires about cub. yds. per mile ; the tieswill be 8 ft. in length, and their number is about 2,325per mile. The total length of sidings will be 10 per 2rp|lU_oh i^ 60 li-o ISO Uasr^ 0-bb mile of the main track. TTie rails are somewhat light—54 or 49 lbs. English to the yard—but this weightwas fixed for the sake of economy. ror the roadmaslers, road-workmen and Ihe trackwatchmen there will be section-houses, great and small,and watchmens houses. All these buildings will be con-structed of brick or wood, according to the facility of get-ting materials. The distance between large section-housesis fixed at 12 miles ; this interval is divided by small sec-tion-houses and watchmens houses, so that the road sec-tion will be 4 miles and the watchmans beat 2 to 3 miles. For the division between Chelabinsk and the Obi therewill be required 82 large section-houses, 150 small section-houses and 184 watchmens houses. There will be 397road crossings There will be in all 33 stations built on the type gener-ally adopted on the State railroads, two—Chelabinsk andOmsk—being rate
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
