. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ma-terial selected is called molded mica andthe vital parts are embedded in a mi.\-ture of ground mica and shellac which,while plastic, are formed under heavyhydraulic pressure into a hard, compact,air tight, gas resisting substance. Theseplugboxes shown among our illustra-tions have been designed by Mr. O. , the superintendent of the Ber-gen tunnel on the Erie. THE OXFORD TUNNEL ON THE D., L. & W. The Oxford tunnel on the Delaware,Lackawanna & Western Railroad, nearOxford station, i
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ma-terial selected is called molded mica andthe vital parts are embedded in a mi.\-ture of ground mica and shellac which,while plastic, are formed under heavyhydraulic pressure into a hard, compact,air tight, gas resisting substance. Theseplugboxes shown among our illustra-tions have been designed by Mr. O. , the superintendent of the Ber-gen tunnel on the Erie. THE OXFORD TUNNEL ON THE D., L. & W. The Oxford tunnel on the Delaware,Lackawanna & Western Railroad, nearOxford station, is about 4,620 ft. long,and as it is only w-ide enough forpractically one line of rails there is a single track one. with traffic movingboth ways in the tunnel. The protection of this tunnel is pro-vided for by the placing of an electricslot signal about 600 ft. from each ofthe two portals, and 50 ft. in advance ofeach signal a derailing switch is put are two signal towers, one neareach of the slot signals. The interlocking arrangement is suchthat the slot signals stand in the nor-. LACKAWANNA No. 2 EXPRESS COMINGOUT OF THE OXFORD TUNNEL. ma! stop position, and the distantautomatic signals of the previous blocksconsequently stand normally in thecaution position. The derailingswitches are both normally open so thatthe gauntleted track through the tunnelis at all times broken so that nothin!< can enter the tunnel without the knowl-edge and consent of the signalmen. When a train approaches the tunnelon the westbound track, the derailingswitch on that track is closed by thesignalman in the tower. This actionlocks the slot signal in the stop posi-tion at the other end of the tunnel,and it, at the same time, permits theclearing of the home at the westernportal. After the train has passed, thesignal goes automatically to the stopposition and cannot be cleared by eithersignalman until the train has entered theblock ahead. Although it is pos-sible to close both derails
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