. The street railway review . at the center. The river section is concreted,covered with asphalt mortar and laid with flagging, sothat by no mischance can the tunnel be broken into by avessel striking the river bottom. Samuel G. Artingstallwas chief engineer and C. V. Weston was superintendingengineer. The appliances for the safety of passengers, include anunique feature, namely THE RACK RAILWAY. When the new Van Buren street tunnel of the WestChicago Street Railway was proposed, it was also deter-mined to introduce absolute safety devices on the this end, a rack railway plan has bee
. The street railway review . at the center. The river section is concreted,covered with asphalt mortar and laid with flagging, sothat by no mischance can the tunnel be broken into by avessel striking the river bottom. Samuel G. Artingstallwas chief engineer and C. V. Weston was superintendingengineer. The appliances for the safety of passengers, include anunique feature, namely THE RACK RAILWAY. When the new Van Buren street tunnel of the WestChicago Street Railway was proposed, it was also deter-mined to introduce absolute safety devices on the this end, a rack railway plan has been adopted. On each side of the slot rail half way between the slot andtrack rails is set a rack rail which will engage with apinion on a separate axle of the grip car. The rack willextend entirely through the tunnel except the 200 footlevel stretch at the center. The rack, a section of which is illustrated, is in 3-footiij^-inch sections, weighing 256 pounds each. It is 6inches wide, with teeth 2^ inches high and of 3 inches. ELEVATION OF RACK DEVICE. pitch. A wooden liner surfaces the iron and woodencushions between the rack and yoke taking off the shear-ing strain from the bolts which hold it to the yoke. Theentrance to the rack is provided with a differential racksection supported at the entering end by a coiled spring,which allows the pinion to mesh with the rack, no matterat what speed the car may go. The pinion of each gripcar will be carried high enough to clear any obstruction ^ticctlF^aika^lf^ylew^ 289 on the street, and being on a separate axle, will beset to engage with the rack on entrance to the friction brake mounted on the pinion axle is to bepowerful enough to stop the car in any distance pinions weigh 150 pounds each, or an equal to theweight of two passengers. The conclusion of the matterand tests will be watched with interest.
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
