. Railroad digest . inished. The temperatureof the head of the rail is decreased and strains prevented dur-ing the final process of cooling. The process is equally ap-plicable to girders having light webs and heavy heads or flangedparts. Corrosion of Steel Rails by Sea Water inTropical Countries Railway Engineer (London), Nov., 1901, p. 325. Mr. J. W. Post, engineer divisional chief of NetherlandState Ry., says: In the late Mr. Brickas paper on steel rail.^,it is stated that the destructive action of sea water on steelrails is only obvious in the case of tracks being in the im-mediate neighbor
. Railroad digest . inished. The temperatureof the head of the rail is decreased and strains prevented dur-ing the final process of cooling. The process is equally ap-plicable to girders having light webs and heavy heads or flangedparts. Corrosion of Steel Rails by Sea Water inTropical Countries Railway Engineer (London), Nov., 1901, p. 325. Mr. J. W. Post, engineer divisional chief of NetherlandState Ry., says: In the late Mr. Brickas paper on steel rail.^,it is stated that the destructive action of sea water on steelrails is only obvious in the case of tracks being in the im-mediate neighborhood of sea water, especially in tropicalcountries. There were no other definite data concerning thispoint related to this congress. Referring to Mr. Brickas remark, Mr. Dalprat, chief engi-neer of the Sumatra State Railways, sent me a curious docu-ment, and a piece of a rail which during 10 years has beenexposed more or less to sea water. The track from which thisrail has been taken lies along a quarry in Port Emma. 452 RAILROAD DIGEST Pecember, 1901 (Sumatra) not much above ordinary high tide. A side-trackis placed on a breakwater and its rails show the same phenom-ena of rust. The figure shows the section of the rail whennew and also after 10 years, the rust-layer being removed; thetable shows the diminution in dimensions and in weight. As the width of flange had decreased by more than an inch,the fastenings no more fixed the rail. The inertia-moment ofthe rusted rail-section does not sufiice to resist to the maximumwheel-charge of 5 to 6 tons, which the new rail carries easily. These tracks have not been used for several years. In atrack exposed to regular traffic the oxydation of the rails mighthave been somewhat less. The decrease of weight is about 1 kilogram per meter for1 year, or about 4 per cent, of the weight when new. Thisconfirms the impression obtained by Mr. Bricka. It therefore seems advisable, especially for tropical railwaysand tramways, to use heavy rails ir
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