Scandinavia Railways Society Norwegian Signalling Page

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 semaphore 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.
VioletViolet indicates that the associated level crossing signal shows Stop Short of the level crossing
YellowYellow indicates Caution
Green Green indicates Permission to run
White White indicates Clear Line

Light signals  The standard light signals show one of these states:

Main signals
norwegian signal123
1 Signal 20A -Stop flashes2 Signal 20B- Stop
3 Signal 21- Stop
The train must stop short of the SignalThe train must stop short of the Signal
Used in Home and Block SignalsUsed for Home and Departure Signals

norwegian signal456

4 Signal 21- Proceed to diverging route5 Signal 22- Proceed6 Signal 21- Proceed
The Train can proceed usually via one or more diverging switchesThe train can proceed not via a diverging switch
Used in Home, Departure, Inner, and Block SignalsUsed in Home, Departure, Inner and Block Signals

Fail Safe
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

Distant signals
7 Signal 23- Expect Stop 8 Signal 24 - Expect to proceed to diverging route9 Signal 25- Expect to proceed -
Top light flashes yellowTop light flashes yellow and bottom light flashes greenBottom light flashes green
ssociated Main Signal shows signal 20A or 20BAssociated Main Signal shows signal 21Associated Main Signal shows signal 22

Wrong-side failure
If the yellow light in signal 24 fails, the signal displays a higher speed indication, which would be a wrong-side failure.
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).

Warning Systems
Norway uses the Ericsson ATP warning system, also used on Australia's Perth's suburban railway network.

Signalling Remedies
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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