CONTACT RAIL BOND

FIELD: underground railways; contact rail heavy current expansion joints. SUBSTANCE: contact rail bond has two electrically interconnected similar steel transition plates of thickness D whose surfaces are divided into support-contact section and contact section adjoining support-contact section along straight line of length lok. First section has form of rectangle of length lok and width hok, and second section has form of rectangular trapezium with bases lok and lk < lok and height hk. Conductors are electrically connected with plates within the limits of strip of width lk corresponding to smaller base of trapezium, and support-contact sections lie as a whole, on foot of rail of width h = h«k+Δ and are welded to rail foot over their perimeters by seat with leg Δ. Plates are arranged symmetrically relative to rail joint so that their edges of width hok are parallel to each other and are arranged at a distance from each other and in zone of support-contact sections of both plates not occupied by above-indicated conductors, open slots of thickness, 4Δ are made bottom pointed towards joint. Slots are made through in thickness D and alternate with step 2Δ. Walls of slots are arranged at angle alpha to axis of rail and are welded to its foot. Angle alpha is equal to . EFFECT: reduced overall dimensions, metal usage and electrical resistance of transition plates, increased uniformity of distribution of current over area of rail welded contacts. 1 tbl, 2 dwg