Week 1

• What would a shunting post light look like if it were showing a stop aspect?

  Yellow & White Light

   

  Two Yellow Lights
• What would a position light signal look like if it were showing a stop aspect?

  Two red lights

  
  

  Or

  
  

  One white One red
• How can a position light signal show a proceed aspect?

  Two diagonal white lights
• What does a flashing yellow aspect mean?

  Means facing points at a junction ahead are set for a diverging route with a lower speed than that for a straight route
• What is the purpose of a junction indicator?

  Junction indicators are provided to show that a train is being signalled to route to the left or right of the straight route
• In four aspect signalling, what does a double yellow aspect mean to a driver?

  Premlinary caution - proceed be prepared to find the next signal at a single yellow aspect.
• What does a single yellow aspect mean to a driver?

  Caution - proceed be prepared to stop at the next signal
• What is the normal sequence of four aspect signalling?

  Green

  Double Yellow

  Yellow

  Red
• What is the normal sequence of three aspect signalling?

  Green

  Yellow

  Red
• What must you make sure of before you operate a signal control to allow a signal to show a process aspect?

  T The route is set or is free to be set by the interlocking

   

  I If necessary, you have been given a release by another signaller

   

  N No other movement that may conflict is to be made first
• What is the principle of track circuit block?

  The track circuit block system allows a signal to show a proceed aspect when:

   

  All track circuits, up to the and including the overlap of the next stop signal are clear

   

  All necessary points within the route are detected in the correct position for a train to pass safely.
• What does TCB stand for?

  Track 

  Circuit

  Block
• What is the definition of a signal section?

  The line between two stop signals, whether or not these are within control of the same signal box.
• What is an overlap?

  The distance beyond a stop signal up to which the line must be clear before the previous signal can show a proceed aspect. 
• What does NCR mean on a individual point switch (IPS)?

  Normal

   

  Current

   

  Reverse
• What does PLS stand for?

  Postion

  Light

  Signal
• What is a TCOD?

  Track Circuit Operation Device
• What is a TCOC?

  Track Circuit Operating Clip
• What does TIN stand for?

  The route is set is or free to be set by the interlocking

  If necessary, you have been given a release by another signaller

  No other movement that may conflict is to me made first
• Why would you set a reminder appliance - FIST?

  A signal protecting any faulty signalling equipment

  A signal protecting a route after the driver has been told by the signaller to proceed at caution due to an incident

  A signal protecting a route over which the normal passage of trains is stopped

  A signal protecting a train or vehicles left on a running line where track circuits are not provided
• What is a UWC?

  User Worked Crossing