Werbung
The Netherlands
3.6.
DUTCH RAILWAY SIGNALS
The fotos of this chapter on Dutch signalling are
partly taken from www.nicospilt.com.
3.6.1. S
ignalling SyStem
Netherlands
started
light
experiments in 1923
which resulted in the
fi rst signalling system
that base on light
points only. It was
established in 1949
(but is called the 1946 system)
and uses night aspects of classic
semaphore signals.
The
signalling
between three speed steps and stop.
"High speed" is defi ned as 90 km/h or even
higher depending on the distance between
two signals and the braking distance of the
train. "Medium speed" was defi ned to be
in the range between 45 and 90 km/h and
"low speed" was 45 km/h or lower.
The basic signal has three lights one
upon the other. Either of them can show
white, green or yellow light, the lowest
one can show red additionally. The upper
light controls high speed, the middle one
controls medium speed and the bottom
one controls low speed.
The signals give information on both the
speed range at the signal itself and that
one to be expected at the next signal. Thus
it controls two sections of the line.
In principle two light signals could be used
in cases when high speed is never allowed
P
but these signals exist almost only in
theory.
„P" signal
main
The following fi gure shows typical signals
signal
of the 1946 system:
three
lights
signal
88
dwarf
signal
1946
rail
signal
system
distinguishes
announcing
signals
single
light
signal
On free tracks only one light was used
in many cases. This single light does not
give another speed information than high
speed.
To overcome this disadvantage
fl ashing yellow aspects were introduced.
a
SpeCtS
The three light signal are able to show
10 different aspects, depending on speed
information at the signal itself and the
next one:
this
high
medium
signal
speed
speed
high
speed
medium
speed
low
speed
stop
Single light signals use two different
kinds of fl ashing of the yellow light. Slow
fl ashing informs about a short breaking
distance. Withing the braking distance a
signal can show stop, or the track where
the train is going to has a dead end. Fast
fl ashing yellow light claims very slow
speed and careful driving. The track may
be occupied or a movable signal may be
present which can show stop.
NS signals
next signal
low
stop
speed
Werbung
