A signal might not give its regular stage due to technical failures, some examples are given:
The green lamp is extinguished.
When the green state can not be show, the previous signal is forced to yellow. Arriving trains must stop at the foot of the disturbed signal.
The yellow lamp is extinguished.
When the yellow is not in the regular state, the previous signal is forced to yellow. Arriving trains must stop at the foot of the disturbed signal.
Note: in green state, all signals act normal.
The red lamp is extinguished.
The previous signal will be forced to yellow.
Levelcrossing are linked with the signal that govern them. Disturbed levelcrossing will force the signal to red.
with disturb levelcrossing
There are 2 kinds of permissive signals.
A1) The signal is full automatic. These permissive signals have on their pole a crown (see picture 12.1).
This crown will allow the train engineer to proceed a disturbed or red signal with a restricted speed and without a writing permission.
Signal with crown that allows the train engineer to proceed with restricted speed when the signal is disturb.
A2) The permissive signal protects a level crossing. In this case the automatic level crossing works in cooperation with the automatic signal and a malfuntion of the level crossing can force this signal to red. There is a white box with two red line (instead of the crown) mounted on the pole which contains a line lay-out with all the level crossings for this block. Only when the signal is unoperated or shows red, the trainengineer must take this paper an must fill in a form. He may proceed with restricted speed and must whistle at every level crossing.
This signal stands at kilometer 44.4
In the box, marked with the red lines, the train engineer can find the line lay-out of this block
Example of a line lay-out
89: line number
60: levelcrossing number
29.115 Distance point
Special) The signal is a main signal but his crown lamp is illuminated. This crown lamp has replaced the crown and this signal act as A1, see above.
When the crown lamp is not illuminated, the signal acts as a main signal B
Signal with crown lamp that allows the train engineer to proceed with restricted speed when the signal is disturb.
The driver can always find the neccessarry information on the pole. Main signals are outfitted with a telephone box. Permissive signals aren't.
B13: Telephone communication with Signalbox 13
and distance to
T: Orientation and distance to next telephone box if this telephone is inoperative
Picture 42.1 & .2
The trainengineer must take verbal contact with the signalmaster. Together they will fill in next form.