NSB Norwegian Railway Signalling
The Signalling System used on standard gauge railways in Norway is regulated by the Regulations of December 4,
2001 no. 1336 laying out the Signalling for signals and signs on the state's railway network and connected private tracks.
The first signalling system on the Norwegian railway system was a mechanically operated
system introduced at Drammen station in 1893.
The first electrically operated light signal system was delivered by AEG in 1924.
Today, only electrically operated light signals are used
The fundamental meaning of the signal colours
|Red ||Red always indicates Stop.|
|Violet||Violet indicates that the associated level crossing signal shows Stop Short of the level crossing|
|Yellow||Yellow indicates Caution |
|Green ||Green indicates Permission to run|
|White ||White indicates Clear Line|
Light signals The standard light signals show one of these states:
|1 Signal 20A -Stop flashes||2 Signal 20B- Stop||3 Signal 21- Stop|
|The train must stop short of the Signal||The train must stop short of the Signal|
|Used in Home and Block Signals||Used for Home and Departure Signals|
|4 Signal 21- Proceed to diverging route||5 Signal 22- Proceed||6 Signal 21- Proceed|
|The Train can proceed usually via one or more diverging switches||The train can proceed not via a diverging switch|
|Used in Home, Departure, Inner, and Block Signals||Used in Home, Departure, Inner and Block Signals|
If one of the green lights in signal 22 fails, the indication becomes the lower speed signal 21 -
this is fail-safe
Other Scandinavian countries reverse the role of the single green aspect and double green aspect
|7 Signal 23- Expect Stop ||8 Signal 24 - Expect to proceed to diverging route||9 Signal 25- Expect to proceed -|
|Top light flashes yellow||Top light flashes yellow and bottom light flashes green||Bottom light flashes green|
|ssociated Main Signal shows signal 20A or 20B||Associated Main Signal shows signal 21||Associated Main Signal shows signal 22
If the yellow light in signal 24 fails, the signal displays a higher speed indication, which would be a
To prevent this, the yellow light would be proved to be operating before the green light is displayed (that is,
the yellow is shown before the green, if the yellow fails, the green isn't shown and the signal stays totally dark).
Norway uses the Ericsson ATP warning system,
also used on Australia's Perth's suburban railway network.
The following signalling remedies are used in the case of failures:
|Signal flags|| ||Fixed sound signals|
|Hand-held signal lamps|| ||Signal signs|
|Signal whistle|| ||Orientation poles|
|The signal giver's arms|| ||Locomotive whistle|
|Fixed light signals|| ||Locomotive and train signal lamps|
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