The track brake is a mechanical braking device at the end of expiration mountain in marshalling yards, with the speed of the running rail freight cars is regulated.
Distinction by function
Ramp brakes provide at major stations (usually greater than about 40 to 48 classification tracks, in plants with Russian Shunting but often even in less sorting tracks ) for a preliminary braking so that the hump retarders can fulfill their function.
Hump retarders slow car in front of a group track direction, so that the distance to the previously -running car remains large enough so that the course can be changed in the gap. A Talbremse supplies approximately 6 to 12 ( in Europe mostly 8 ) subsequent classification tracks.
Slope compensation brakes or retarders are smaller brakes that are installed in very large numbers to (eg slope stations with inclined towards track or on flat stations with Ausrollanlage in just this ) to precisely regulate the flow of cars in a constant gradient.
Distinction on the type
Valley and ramp brakes
Hemmschuhauswurfbremsen (after the earlier main manufacturers also called Büssingbremsen ) are not actual track brakes, but end the deceleration of a vehicle by the underlying obstacle is thrown by a similar construction soft side in a catch box.
A three brake is a dependently acting from the car weight bar track brake. Here, the flange runs on a braking element. By car weight, which exerts a vertical force, the braking action of the brake beam is the car weight proportional.
Bars Braking delay the car by brake beams are pressed with wear shoes sideways against the wheels. We distinguish the type of drive:
- Hydraulic: for example, systems Saxby with bars on only one rail of the track or
- Frölich, Thyssen -sided bar; as well as
In some countries only one system and in other countries different systems are in use.
In some braking, the brake beams for the crossing of locomotives can be reduced.
Rubber track brakes let in the locked position the trailing car roll over rubber body that reduce the kinetic energy of the car by flexing / absorb. In the released position the rubber bar remain sunk and the cars pass the brake on the wheel flanges continuously.
There are also stationary eddy current track brakes.
Slope compensation brakes
Screw track brakes are rotatable body with a helical coil to which the flange starts when driving. The energy is converted into rotation of the braking body. Screws brakes can be switched off by folding in and by folding away again.
Dowty retarder are piston-like elements that are depressed when driving and thereby absorb energy. In contrast to most other rail brakes they are not switched off, but always effective. Screws brakes and retarder Dowty act depending on speed, so slow down the stronger, the faster the car is traveling over it. You slow him down on an adjustable steady speed, for example, 1 m / s, from. In the controllable variant as " Dowty booster ", the trailing wagons are not only slowed down as needed, but also accelerated.
Season retarders unite several Dowty retarder in a hinged pivot element and are thus switched off.
Trig ejection brake
Trig ejection brake
Dowty Retarder with wheel