Interlocking Equipment GRS System Flashcards
(28 cards)
True or false Locking tests are performed when the U.S.&S. Relay system is placed in service, when changes are made to the system, every two years after that and anytime the system’s
integrity is in question.
True
Which relay is used to request a left signal?
LGZR
What is the normal position for the LASR when the track is unoccupied and no signal has been requested?
Energized
Which relay assures that the opposing signal control circuits are de-energized when a left signal route is requested?
LFSR
What is the normal position for the WZ relay?
Depends on the last switch position requested.
Why do the GZ relays have TP contacts in their hold circuits?
To allow signal request circuits to reset when a train occupies the ‘OS’ track.
What are the positions of the LH and LD relay contacts when a left signal request is made and one block in advance is unoccupied?
LH up; LD down
What relay contact picks up to provide a path to energize the time element relay when a previously cleared signal goes red unexpectedly?
RP
What happens when the time element relay energizes?
Time locking goes into effect.
Which relay is used to lock the route in the signal clearing process?
AS
When a route for a left signal has been proven, which relay de-energizes, locking the route?
LAS
What are the normal positions of the L and LS relays?
Energized
Which relay is used to monitor the ‘OS’ track circuit integrity?
LBSF
What happens when energy is applied to the 6TE relay?
Time locking goes into effect.
Which relay would be used to prove a left signal into a passing track?
LBSF
True or false When referring to normal as the position a relay is in normal means the relay position when the track is not occupied and when no one has requested a signal
True
What does it indicate if the 6NWC is de-energized?
It indicates that the switch is not normal.
What are the normal positions of the L and LS relays?
The normal positions of the L and LS relays are energized.
True or false Locking tests are performed when the U.S.&S. Relay system is placed in service, when
changes are made to the system, every two years after that and anytime the system’s
integrity is in question.
True
A previously cleared signal goes red unexpectedly, the RHSPR relay drops out and another
one picks up to provide a path to energize the ASP relay. Select the relay that picks up.
The RRGPR
Which relay is used to lock the right signal route?
The relay used to lock the right signal route is RAS.
Which relays are used in step number one of lining a signal in Traffic Control Territory?
The relays used are NWS and RWS.
Which relay assures that opposing signal control circuits are deenergized when a right signal route is requested?
The relay that assures this is RHSPR.
The L relay is used in which step of the eight steps in lining a signal and traffic control territory
Step 6
