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Disturbances

A signal might not give its regular stage due to technical failures, some examples are given:

The green lamp is extinguished.

example:
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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.
p02

The yellow lamp is extinguished.

example:
p04

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. 
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The red lamp is extinguished.

example:
p08

The previous signal will be forced to yellow.

 

Disturbances by levelcrossing

Levelcrossing are linked with the signal that govern them. Disturbed levelcrossing will force the signal to red.

basic lay-out
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with disturb levelcrossing
p07

 

Permission

A) Permissive signals

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.

image60a.jpg (17149 bytes)
Picture 12.1
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.

image84a.jpg (22848 bytes)
Picture 12.2
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.jpg (57481 bytes) 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

i56
Picture 41.3
Signal with crown lamp that allows the train engineer to proceed with restricted speed when the signal is disturb.

B) Main signals

The driver can always find the neccessarry information on the pole. Main signals are outfitted with a telephone box. Permissive signals aren't.

image22.jpg (19807 bytes)

image58.jpg (11515 bytes)

 


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.

14_1.jpg (77460 bytes)

 


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