. Electric railway journal . nted in an inverted position, the foot ofthe rail constituting the contact surface. Experience on the Long Island Railroad and elsewhere withvarious type of insulators has resulted in the adoption by theTerminal Railroad of a simple and substantial form of in-sulating block for supporting the third-rail. These blocks areof porcelain, made by the dry process, which gives a verytough and mechanically strong insulator, with ample and per-manent insulating qualities. For the open sections of the road asimple rectangular block with rounded corners is used; in thetunnels
. Electric railway journal . nted in an inverted position, the foot ofthe rail constituting the contact surface. Experience on the Long Island Railroad and elsewhere withvarious type of insulators has resulted in the adoption by theTerminal Railroad of a simple and substantial form of in-sulating block for supporting the third-rail. These blocks areof porcelain, made by the dry process, which gives a verytough and mechanically strong insulator, with ample and per-manent insulating qualities. For the open sections of the road asimple rectangular block with rounded corners is used; in thetunnels, where in places there is dampness due to condensationor salt seepage water, a petticoat-type insulator is used whichfurnishes a more extended surface to provide against leakageof current. The heavy-section rail is bonded with ribbon type, com-pressed-terminal foot bonds, four to a joint, having a con-ductivity equivalent to 80 per cent of that of the light-section rails for the yards are bonded with the pro-. Pennsylvania Tunnel—Section of Third-Rail and Protectionfor Yard Tracks tected-type, pin-terminal cable bonds. The third-rails through-out are protected by a continuous plank carried on wrought-iron brackets secured to the third-rail ties. On the open line thisplank is of yellow pine, but in the tunnel Jarrah wood, importedfrom Australia, has been used because of its slow-burningqualities. The connections to the third-rail from substations andswitching stations are made by insulated cables of 2,000,000circ. mil section for the heavy rail and 1,000,000 circ. mil forthe light rail. The cables terminate in special porcelain pot-heads from which flexible cables are connected to the third-railby bond terminals. Throughout the main tracks both rails of each track arebonded; in the yards, however, only one rail is bonded. In theopen, where there is danger of theft of copper, the bonds areof the protected type, placed under the joint angle-bars; in thetunnels an
Size: 1463px × 1707px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidelectricrailway371911newy
