. American ENGINEER and Railroad journal . les ossings sont boulonnés sont placés en ligne avec les axlecentres. La construction de la traverse est la plus importante. Les canaux profonds utilisés à cet effet sont maintenus en position par des supports de plaques à angle simple et double forgés et des plaques de wroughttusset. La construction de la plaque de jonction, en particulier, a fait l'objet d'une attention particulière car la perpendicularité du chariot se détare dans une large mesure sur la construction à ce stade. Les plaques sont de grandes dimensions pour les contraintes les plus sévères, etsont repliées sur le côté du châssis forgé et boulonnées à l'unité

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. American engineer and railroad journal . ossings are bolted are placed in line with the axlecenters. The transom construction is most substantial. The deep chan-nels which are employed for this purpose are held in positionby wrought single and double corner plate brackets and wroughtgusset plates. The gusset plate construction in particular hasbeen given special attention as the squareness of the truck de-pends to a large extent on the construction at this point. Theplates are of ample dimensions for the most severe strains, andare folded over the side of the forged frame and bolted to theframe with bolts which also pass through the wrought platebrackets. This method of bolting the gusset places the mini-mum number of bolts in shear and secures unusual strength andrigidity. One of the weak points of many M. C. B. trucks has beenthe tie bar construction, and the construction at this point in The manner in which this truck has been developed duringthe past three years, it is believed, has eliminated all experi-mental features.. TRUCK FOR ELECTRIC CARS. this design, it is believed, is a marked advance. Channel tiebars connect the inner pedestals and short tie bars connect eachpair of pedestals. The tie bars are bolted through the framein such a manner that they form a rigid reinforcement to thepedestals and, by a simple device, absolutely remove the shear-ing strain from the bolts. The short tie bars can be readily re-moved and the wheels and axles dropped. The bolster is cast steel, including the lugs for the side bear-ings, and rests on two elliptical springs which in turn bear ontwo part castings in such a manner that shims can be readilyplaced between the springs and the castings to compensate forwheel wear or settling of the springs. The chafing plates onthe bolsters and transoms can be taken off and renewed with-out removing the bolster from the truck. Both of these featuresare designed to reduce maintenance charges. An additional feat-ure of the bolster chafin

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