System block for convoy protection
 This module is used to prevent your fast trains from catching up with your slower trains.
 This system is very simple to implement.
 1 module can already be enough for 2 trains, the more modules you add, the more trains can run at the same time and safely.
 The adjustable slowdown and start are progressive.
 The control is done by them (flexible blade switch), themselves triggered by a magnet placed under the loco.
 2 wires are required per module.
 Ref: JLK68