Lenz Digital plus BM1 Betriebsanleitung Seite 7

Technically, this is realised as follows: if
the signal is "red", the BM1 module
creates in the braking section an
asymmetry in the otherwise symmetrical
digital track voltage. This is spotted by
decoders. The result is a gentle braking
of the train until it comes to a halt,
optionally with the set braking delay or
set braking distance.
If the train is not to stop, but to continue
unimpeded or to start moving again
after the stopping time has elapsed, the
BM1 will simply be bridged with a
switch.
4 Installing the BM1
First, define the length of the braking
section in front of the signal. Keep in
mind that the fastest train on your layout
must be able to come to a standstill
within this section. If available, use the
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