. American engineer and railroad journal . ommencing the work, the first stepconsisted in laying down a rail track underneath each line ofposts, as shown in fig. 2, and then building round each doublepillar a truck mounted upon two axles, with wheels 2 ft. indiameter. These axles are 4 ft. 3 in. apart, and are united by-longitudinal side and end pieces of oak bolted together ahaforming the frame of the truck, figs. 2 and 3. Upon the sidepieces are placed two cross sleepers of pine, which carry thevertical flitches bolted lengthways to the posts. The crosssleepers are maintained in their place
. American engineer and railroad journal . ommencing the work, the first stepconsisted in laying down a rail track underneath each line ofposts, as shown in fig. 2, and then building round each doublepillar a truck mounted upon two axles, with wheels 2 ft. indiameter. These axles are 4 ft. 3 in. apart, and are united by-longitudinal side and end pieces of oak bolted together ahaforming the frame of the truck, figs. 2 and 3. Upon the sidepieces are placed two cross sleepers of pine, which carry thevertical flitches bolted lengthways to the posts. The crosssleepers are maintained in their place on the frame of thetruck by four chocks bolted on. In order to lift a post on toits special truck, it was necessary to raise the sleepers byscrew-jacks about 3i in., and since they are bolted to the post,the latter cleared its brick pillar, and was kept in place bysuitable wedges driven in between the bottom of the sleepersand the side frame of the truck. As a precaution against theoccurrence of any deformation of a magnitude likely to be. CONNECTION OF TRUCKS AND HAULING TACKLE. dangerous, a pair of posts in the same range were lifted at atime, the whole 3J in. being divided between a couple of Boon as all the trucks had received their loads they wirecoupled together by wrought-iron rods 1J in. in diameter totransmit the traction in the line of the posts, and also for thepurpose of preserving the exact distance between them. Itwas necessary to arrange the lift in such a manner that whenthe cross sleepers had to be lowered they should not touch theside frame of the truck before the posts had taken their bear-ings upon the new piers, as it was impossible at that stage ofthe operations to dismount the axles. At the far end of tin- distance to be traversed, about 200 ft.,and in alignment with the axis of each of the two lines ofposts, was fixed the hauling arrangement, which was tints in-stalled. A couple of otik piles, 20 ft. long and 14 in. in diam-eter, were driven int
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
