. Electric railway journal . parison of the subway with the section of the elevatedabove noted, both sections having been subjected to pre-cisely the same amount of traffic. They are constructedwith rail of the same weight and quality, and the sametype of joint plates and method of fastening rails toties. An analysis of the expenditures running throughseveral years, after eliminating such charges as wouldbe common to any type of construction, indicates amaintenance cost for the subway track of about one-half that of the ballasted track, or approximately $528per mile per year for the subway tra
. Electric railway journal . parison of the subway with the section of the elevatedabove noted, both sections having been subjected to pre-cisely the same amount of traffic. They are constructedwith rail of the same weight and quality, and the sametype of joint plates and method of fastening rails toties. An analysis of the expenditures running throughseveral years, after eliminating such charges as wouldbe common to any type of construction, indicates amaintenance cost for the subway track of about one-half that of the ballasted track, or approximately $528per mile per year for the subway track as against $1,056for the elevated ballasted track. The initial cost of concrete construction is estimatedat $44,352 per mile, and the ballasted construction$24,288 per mile. In the ballasted construction the cost. Philadelphia Subway Track—Views Showing the Four Steps Followed in Laying Rails Each rail is mounted on a series of wooden blocks which are held in position by %-in. bolts passing through the blocks and theupper flanges of two 15-in. channels. The channels are spaced 15 in. apart by separators, and the space between them is filled withconcrete so that the wooden blocks rest directly on the concrete. No ballast of any kind is used, so that the subway is very easyto keep clean. September 16, 1916] ELECTRIC RAILWAY JOURNAL 483 of a concrete sub-base under the ballast has been in-cluded. Basing an estimate on past experience we haveplaced the life of the rail in the concrete constructionat ten years and in the ballasted construction at sixyears. As to the ties, we have no definite informationas to how long untreated ties will last in the present ties are in first-class condition after nearlyten years of service, and for the sake of comparison wehave placed the life at fifteen
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