. Railroad construction : theory and practice : a textbook for the use of students in colleges and technical schools . are almost an essential featurefor yards doing a large business. The transportation of built-up girders, castings for excessively heavy machinery, etc., whichweigh five to thirty tons and even more, creates a necessity formachinery which w^ill easily transfer the loads from the car tothe truck andmce versa. An ordinary gin-pole will serve thepurpose for loads which do not much exceed five tons. A fixedframework, covering a span long enough for a car track and ateam space, with
. Railroad construction : theory and practice : a textbook for the use of students in colleges and technical schools . are almost an essential featurefor yards doing a large business. The transportation of built-up girders, castings for excessively heavy machinery, etc., whichweigh five to thirty tons and even more, creates a necessity formachinery which w^ill easily transfer the loads from the car tothe truck andmce versa. An ordinary gin-pole will serve thepurpose for loads which do not much exceed five tons. A fixedframework, covering a span long enough for a car track and ateam space, with a trolley traveling along the upper chord, is thenext design in the order of cost and convenience. Increasingthe span so that it covers two car tracks and two team spaceswill very materially increase the capacity. Making the framemovable so that it travels on tracks which are parallel to thecar tracks, giving the frame a longitudinal motion equal to twoor three car lengths, and finally operating the raising and travel-ing mechanism by power, the facility for rapidly disposing of § 298. YARDS AND TERMINALS. 347. East 135th St. Fig. 166.—Minor Freight Yard on a Harbor Front. 348 RAILROAD CONSTRUCTION. § 299 heavy articles of freight is greatly increased. Of course only avery small proportion of freight requires such handling, and thebusiness of a yard must be large or perhaps of a special characterto justify and pay for the installation of such a 165 and 166 each indicate a transfer crane, evidently of thefixed type. 299. Track scales. The location of these should be on one ofthe receiving tracks near the entrance to the yard, but not on themain track. It is always best to have a dead track^ over thescales—, a track which has one rail on the solid side wall ofthe scale pit and the other supported at short intervals by postswhich come up through the scale platform and yet do not touchit. These rails and the regular scale rails switch into one trackby mea
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