. Electric railway journal . For example, when the car iscoasting the bolster is free to ride upon its springs,but when the torque of the motors or the pressurefrom the brakes forces the bolster against the chaf-ing plates, there is a certain amount of friction, andvery frequently a locking effect, which interfereswith the swinging as well as the spring action, andmay stop it altogether, resulting in rough, jerky rid-ing. By the employment of the new device, whichis called a bolster guide, this condition may be en-tirely removed. The guide is shown in one of theaccompanying illustrations of a
. Electric railway journal . For example, when the car iscoasting the bolster is free to ride upon its springs,but when the torque of the motors or the pressurefrom the brakes forces the bolster against the chaf-ing plates, there is a certain amount of friction, andvery frequently a locking effect, which interfereswith the swinging as well as the spring action, andmay stop it altogether, resulting in rough, jerky rid-ing. By the employment of the new device, whichis called a bolster guide, this condition may be en-tirely removed. The guide is shown in one of theaccompanying illustrations of a truck of the M. C. , appearing between the brake release springand the side bearing on each side of the truck. Itconsists of a pair of links pivoted at one end to thebolster and at the other to the transom, allowancefor play or side swing of the bolster being providedunder spring pressure. Consequently, the bolsterfloats on top of its springs and is held in position [ 628 ] September 30, 1916 ] ELECTRIC RAILWAY JOURNAL. Truck Equipped with Bolster-Guide Links Pivoted to Ends of Bolster and to Transom exactly parallel with the transom, although it isable to move freely up and down or sidewise to pro-vide swing easement at curves. As the links arepivoted to the truck bolster on the vertical centerline of the trucks pivot plate, a dead-center pull onthe truck bolsters is established when brakes areapplied, and this absolutely prevents the bolsterfrom tilting. Modifications of the M. C. B. Truck For swiveling city-car trucks, certain variationshave appeared in the location of the swing linksthat carry the bolster, thus modifying the B. design, in which the links invariably hangfrom the transoms and support a spring plank thatcarries the elliptical springs upon which the bolsterrests. One of these alternative arrangements is tohang the swing links from the top member of thetruck-side, so that they support directly the ends ofa half-elliptical spring, on top of which rests
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