Derail

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A track barrier, which in Austria Gleissperrsignal shoe, is a mechanical edge protection device in railway tracks. In the language of railwaymen it is also called " dog", " witch " or " rug ".

Function

A track lock prevents driving on the track with rail vehicles with the track via the secure lock point addition. With track locks to secure in Germany sidings of a railway station, which open into the main tracks, and under certain conditions, the branching off from the free section of track junctions. Track locks to prevent accidents caused by particular side-on collisions that can be parked by the rolling, accidentally unsecured rail vehicles or caused by a shunting as well as protection switches. You are in contrast to signals, which only work when they are observed, the " immediate " or "compelling " flank protection. Driving over an applied track blocking leads to the derailment of the rail vehicle in the opposite direction of the track to be protected. The metal lock block ( derailment shoe) the track lock can be rolled over only by lifting a wheel of the rail vehicle and so bring the vehicle in the " ejection direction " side away from the rail and to derail.

Construction

In Germany there is a track from a folding lock on a rail derailment shoe, which is supported in DOMICILED position on a support bracket. When operational necessity it is provided with a Gleissperrsignal, with track locks that are not in sequence, depending on turnout and therefore may be run over by the rear, two shunting signals ( one each for one direction ) is obtained. Served local track locks that are frequently changed, get a hand actuator with hand weight. For the switching without this there is the derailment shoe a welded handle. In order to minimize damage if derailment, is on the opposite side of the track derailment shoe built an expiration threshold for the processes taking place inside wheels when ever built derailers. A Stemmschwelle between the rear and the subsequent threshold distributes the shock of the incident axes on several thresholds and thus secures the position and function of the track blocking.

The production of secondary dependence can lock a track are equipped with track lock locks for up and stowed position. Remote controlled derailers get a design of interlocking corresponding drive, in principle, a turnout drive. Mechanical lock track drives also have a dome lever that holds the track blocking in the end positions and also compensates for variations of the travel. In the interlocking track locks are treated as protective switches, for which no connecting track together. If the track blocking hook, then the associated Gleissperrsignal shows the signal term Sh 0 as a form of signal ( A horizontal black stripes in round white plate on a black background) and if the position must also be recognizable from the rear, two white lights side by side. If the track blocking stored, the signal showing the term Wn 7 ( A vertical black stripes in a round white plate on a black background) and on the back of a white light. The signal may be illuminated from within, otherwise the white surfaces are retroreflective.

In Germany there with similar functionality also derailing switches which branch leads without track degree in the gravel. The course of this signal corresponds to the course of derailers. In other countries realized technically different constructions are known. For example, in Portugal there is erected with chains folding steel elements.