. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . onsequence. Southern Pa-cific trains were run with great cautionat a speed of not more than 12 miles anhour for a considerable period of time. At Gibson a heavy snow slide coveredthe track early in January and the heavyand laborious work of cutting through itwas prosecuted with vigor by the railwayofficers and employees. Scarcely had theline been opened for traffic when a secondheavy snow slide submerged the trackat the same place, but the work of clear-ing it away went on without hesitation


. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . onsequence. Southern Pa-cific trains were run with great cautionat a speed of not more than 12 miles anhour for a considerable period of time. At Gibson a heavy snow slide coveredthe track early in January and the heavyand laborious work of cutting through itwas prosecuted with vigor by the railwayofficers and employees. Scarcely had theline been opened for traffic when a secondheavy snow slide submerged the trackat the same place, but the work of clear-ing it away went on without hesitation ordelay. Those who live in the compara-tively flat parts of the country and whosee only falls of light snow or drifts fillthe railway cuttings have no idea of theintensely ice-like mass which wet snowmakes on the track when it comes downfrom even a comparatively insignificantfisure or crevice in the mountains. Thisheavy, solidly packed snow cannot beshoveled out in the ordinary way andthe wedge plow is useless against times the rotary plow cannot cutits way through the slide until portions. TIU( K DEP.\K 1 ,\1LM . of it are broken by the use of the pickand even dynamite has been used to dis-lodge solidly frozen portions of the slidewhich usually contain earth, stones, frag-ments of trees and other matter, difficultto dfeal with. 126 RAILWAY AND LOCOMOTIVE ENGINEERING March, 1909. Eduactional Chart No. appended list of questions and an-swers in connection with our EducationalChart No. 10 completes the series whicliwas begun in the January issue of thepresent year. .\s llie call for copies ofthe January issue of and Loco-motive Engineering has surpassed ourexpectations we would state thai \vc arcunable to fill further orders in regard tothat particular issue. We hope, however,to be able to find space in the April issueto republish the complete list of questions EducdimlCtetNMO 29. What is the difference between backpressure and compression? A. B


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