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Notes on Track
Construction and Maintenance
by W. M. Camp—1904
Editor of the Railway and Engineering Review
Member of the American Society of Civil Engineers

 

147. Loading Logs.—On roads where logs are handled as traffic it sometimes becomes necessary to reload logs which have rolled off the cars, and on any road running through forests large trees will occasionally fall across or into the cuts and have to be removed. One way of handling trees is to roll them into the track, drag them out of the cut with the work train, and then roll them down the embankment, if there be one near. If the logs or trees must be loaded onto cars, however, it may as well be done in the cut, at the first handling, or once for all. For lifting the logs the derrick or wrecking car can be used, of course, but with this means only one car can be loaded before it becomes necessary to switch the cars in order to get an empty car next the derrick. A convenient method quite frequently resorted to is the use of a parbuckle, the hauling being done by the engine or train. The arrangement is quite simple and is shown in Fig. 370. The car to be loaded is placed opposite the log and the brake set. A rope is then passed around the log, near one end, one part (A) of which is passed over the car floor and, after being looped around the rail under the far side of the car, is made fast to the snatch block C. The other part (B) is passed through the snatch block and is pulled on by the locomotive, the part A remaining stationary. Two sets of ropes and snatch blocks being arranged as shown—one set near each end of the log—both are pulled on at the same time, so that both ends of the log come up evenly. On the car the log should be rolled onto skids, so that the ropes can be easily taken from under it. It is better to use a ¾ or seven-eighth-inch wire rope than a hemp rope, as a hemp rope would be rapidly worn out in being drawn over the edge of the car. A chain might be used for anchoring the snatch block to the rail, instead of looping the rope. The log can be slung or raised by a straight lift, over the edge of the car, but it is easier on the ropes and a better plan every way to use skids, as shown in the figure, pieces of rail answering well for such purpose.


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