. Costruzione ferroviaria, teoria e pratica; un testo-libro per l'uso di studenti in scuole universitarie e tecniche. Guado e scarico al terminale di trasporto merci principale. Le auto sono portate a questi cantieri a volte galleggianti (come è fatto in modo estensivo in vari punti intorno a NewYork Harbour), o sono gestiti Do^ti su un lungo siding runninglforse attraverso le strade della città. Ma la caratteristica essenziale offquesti cantieri è il massimo utilizzo di ogni piede quadrato di spazio di cortile, che è sempre molto prezioso e che è frequentatadi una forma scomoda che una grande ingenuità è richiesto ottai
1029 x 2428 px | 17,4 x 41,1 cm | 6,9 x 16,2 inches | 150dpi
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. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . ading and unloading at the mainfreight terminal. The cars are brought to these yards sometimeson floats (as is done so extensively at various points around NewYork Harbor), or they are run do^Ti on a long siding runninglperhaps through the city streets. But the essential feature offthese yards is the maximum utilization of every square foot ofyard space, which is always very valuable and which is frequentlyof such an inconvenient shape that a great ingenuity is requiredto obtain good results. There is generally a temptation to useexcessively sharp curves. When the radii are greater than 175feet no especial trouble is encountered. Curves wdth radius asshort as 50 feet have been used in some yards. On such curvesthe long cars now generally used make a sharper angle with eachother than that for which the couplers were designed and spe-cial coupler-bars become necessary. The two general methodsof construction are (a) a series of parallel team tracks (as pre- §381 YARDS AND TERMINALS. 407. 408 RAILROAD CONSTRUCTION. § 382. viously described and as illustrated further in Fig. 165), and (h)the loop system/ as is illustrated in Fig. 166. 382. Transfer cranes. These 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 will easily transfer the loads from the car tothe truck and vice 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. Mak
