. Train et train de locomotives : un journal pratique de la force motrice ferroviaire et du matériel roulant. ir de Wad-dell & Harrington ponts verticalift à double voie au-dessus de la rivière Calumet au sud de Chicago, Illinois, le premier havingété achevé en décembre précédent. Ces ponts remplacent une double piste de balancement de quai de centre de voie, fournissant deux voies supplémentaires, et ont été faites de la ligne d'eau de cou. Les deux ponts se ressemblent; chacun se compose d'une treillis rivetée de 210 pieds centre à centre des montants d'extrémité, les trétrusses étant de 36 pieds en profondeur betweenchord centres, et espacé de 31 pieds. 3 pouces centre à centre avec un

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. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ir of Wad-dell & Harrington double track verticallift bridges over the Calumet River atSouth Chicago, Illinois, the first havingbeen completed the previous December.These bridges replace a double trackcentre pier swing span, providing twoadditional tracks, and were made neces- water line. The two bridges are alike;each consists of a riveted truss span 210feet center to center of end posts, thetrusses being 36 feet in depth betweenchord centers, and spaced 31 ft. 3 ins.center to center with a distance of 6 ft.0 ins. between the centers of the adjoin-ing trusses of the two spans; and twotowers one at each end, which are 31 ft. are connected to the top of the end postsof the span and secured to the steelframework of the counterweights in sim-ilar fashion. The counterweight consistsof three concrete blocks at each end, eachbeing 46^ ft. in length by 2 ft. in widthby 19 ft. in depth and weighing 150 tons.These blocks are joined together at the topbv links and are fastened to the cables. END VIEW OF DOUBLE TRACK VERTICAL LIFT BRIDGES OVER THE CALUMET RIVER, SOUTH CHICAGO, ILL. sary by reason of the straightening andwidening of the channel by the UnitedStates Government, and also by reason ofthe raising of the grade of the tracks inaccordance with the Track Elevation Or-dinances of the City of Chicago. The channel at this point is 140 feet inwidth and makes an angle of SO degreeswith the center line of the tracks. A clearheadroom of 22 feet in the closed and 120in open position is provided above the 3 ins. wide by 41 ft. 0 ins. long and about165 ft. 0 ins. in height from the masonryto the center line of the sheave bearings.At each corner of each tower is a built-up sheave 15 feet in diameter. Thesesheaves are set directly over the towercolumns and serve to carry the counter-weight cables. The latter are of plowsteel, 2Y% ins. in diameter, there beingtwelve cables for each

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