Breakthrough time

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As a strike-through time or strike-through time applies to compressed air and vacuum brake the time between the folding over of the driver's brake valve into the rapid brake application position and the start of pressure rise in the brake cylinder of the last vehicle .

Breakdown speed with the automatic air brake

The initiated braking should propagate in the shortest possible time to the end of the train. The faster this happens, the shorter the braking distance . The speed at which a braking effect until the end of the train is known as the breakdown speed.

  • Breakdown time.PNG

There is an analogous situation when solving . It is exacerbated by the fact that the air is required both to refill the auxiliary air tanks and to increase the pressure in the main line .

The control valve is usually equipped with an acceleration valve. This has the effect that a certain amount of compressed air flows out of the main line on the spot when braking. As a result, the breakdown speed can be increased from approx. 90 to 180 m / s to approx. 250 to 280 m / s, which is almost the speed of sound .

Breakdown speed with the vacuum brake

In general, the same applies to the breakdown speed with the vacuum brake as with the compressed air brake. The breakthrough speed is usually 15 m / s, with rapid braking approx. 200 m / s.

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