. The Street railway journal . ake is not in operation, thesuspension springs carry the track magnets and shoes entirelyclear of the rails, and, by means of their flexibility, permit theshoes to ride over or clear any obstruction not sufficient to causethe car to be stopped. When the brake is applied, through the ferent equipments, they lack similarity in some particulars. Inthis connection it should be noted that, while the thrust against thewheel-brake shoes, caused by the drag or frictional resistance be-tween the track-shoe and the rail, is similar in its effect to thethrust obtained from
. The Street railway journal . ake is not in operation, thesuspension springs carry the track magnets and shoes entirelyclear of the rails, and, by means of their flexibility, permit theshoes to ride over or clear any obstruction not sufficient to causethe car to be stopped. When the brake is applied, through the ferent equipments, they lack similarity in some particulars. Inthis connection it should be noted that, while the thrust against thewheel-brake shoes, caused by the drag or frictional resistance be-tween the track-shoe and the rail, is similar in its effect to thethrust obtained from the expansive force of compressed air actingupon the brake-cylinder piston in the well-known air brake, themagnetic brake has a decided advantage over the older type inthis particular, viz., that the brake-shoe pressure is automaticallyregulated by the condition of the rail surface. This is a fortunatefeature, which results in securing the highest possible brakingpower at all times without danger of wheel sliding. For FIG T, —VIEW OF BRAKE FIG. 5.—METHOD OF ATTACHMENT TO A MAXIMUM TRACTION TRUCK saturation of the magnets with current supplied by the car motorsacting as generators, the track-shoes are strongly attracted to therails, producing three distinct effects: i. A noticeable increase inthe pressure of the wheels on the track, because of the downwardpull of the magnets. 2. A pronounced retardation by reason ofthe friction generated between the track-shoes and rails. 3. Amaximum braking effect on the wheels, obtained through thetransmission of the resultant drag of the track-shoes to the brake-shoes by means of the mechanism provided for that purpose. It is obvious, therefore, that the net result of these three effectscombined represents a very high braking power, while, more- if the rail be dry and sandy, the drag of the track-shoes and theconsequent thrust upon the levers applying the brakes to thewheels are great; if the rail be wet or greasy, the drag of t
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Keywords: ., bookcentury1800, bookdecade1880, bookidstreetrailwa, bookyear1884
