2. The hump yard can't run without the anti-slip line, because some vehicles or the nature of the goods they load determines that they can't run at high speed from the hump.
No slip line is neither at the peak nor at the bottom of the peak. This is a line laid in front of the hump. The specific length varies with marshalling stations. If it is long, it is the track (the effective length is greater than 1000 meters). If it is short, it is more than 200 meters. Is there a problem?