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====Track part====
==SHP (Samoczynne hamowanie pociągu)==
[[File:tratovashp.jpg|none|thumb|Track part of SHP]]
[[File:SHP.png|center|frameless]]
The track part consists of resistors, called electromagnet, which is located at a distance of 200 to 150m in front of the signal or autoblock.
SHP is split into two parts - Train and Track.
====Train part====
[[File:vlakovashp.jpg|none|thumb|Train part of SHP]]The sensors of the train section are covered by a magnet which emits a radio pulse to activate the SHP control in the driver's cab (driver vigilance).
Both track-side and train-side parts are tuned to 1000 Hz.
If the driver does not press the vigilance button, the emergency brake is activated.
