Route Set

Question 1

Are the following relays located in the relay room or cupboard location.
HR-HDR-DR-UCR-VNR-VCSR-RUR-NWKR-WZR-ALSR-NWR

Answer 1

Location - HR HDR DR VNR,
Relay room

Question 2

What is the purpose of the NLKPR/RLKPR

Answer 2

They are the lock and detector repeat relays. Prove points are locked and detected in the correct position and locked by the interlocking (RUR up, NLR down so WZR is down) before a signal can clear

Question 3

What is the purpose of a track circuit

Answer 3

To prove the signal and trainstop have returned to stop after the passage of a train.

Question 4

Why are magnetically latched relays used

Answer 4

They provide memory storage functions so that if power is lost, it will remain in the same position.
Used in points NLR/RLR circuits and signal route NLR/RLR circuits

Question 5

What is the purpose of the WZR

Answer 5

Indicates if the points are free and would respond to a call. slow to release relay to prevent RUR from dropping out during the operation of point lock relays.

Question 6

What is the purpose of the USR

Answer 6

Holds locking of a route after train enters the route

Question 7

What is the purpose of the UCR

Answer 7

Checks all trakc snad points detection for signal controls

Question 8

What is the purpose of the ALSR

Answer 8

Hold locking if signal placed normal in face of train

Question 9

What is the purpose of the NKR and the difference to a NWKR

Answer 9

Indications points Normal/reverse. Local to points.
NWKR/RWKR indicates points Normal/Reverse at the interlocking

Question 10

What is the purpose of EMR

Question 11

What is the purpose of the CeR

Answer 11

defines and initiates route to be set

Question 12

What is the purpose of the MUR

Answer 12

To ensure that the next button operated initiates the finish operation for the route

Question 13

What is the purpose of a guards indicator and what colour is it

Answer 13

To indicate to a train guard that the signal ahead has cleared and they can depart when safe.

Question 14

What is the purpose of the MUKR

Answer 14

it is a repeat of the MUR, gives flashing red or green indications. Indicates to the signalman if the machine is in use or finish.

Question 15

What is the purpose of the (FM)R

Answer 15

emergency replacement of a signal after the route has been set

Question 16

what is the purpose of the finish timing relays FnJR and FnJPR.

Answer 16

provide the timing sequence initiated by the finish function to provide non storage feature of the system.
routes cannot be pre-selected until a train has exited the route.

Question 17

What does the NLR prove

Answer 17

the signal has returned to stop
the signal is not approach locked
the route RUR is de-energised and therefore not capable of setting points or clearing the controlling signal

Question 18

What is the purpose of the RUR and what does it prove

Answer 18

It proves the NLR is latched down. it is used to set points and clear the entering signal, also checks for any conflicting routes are normal before they route can be set.

Question 19

What is the purpose of a lock relay

Answer 19

they perform route and interlocking functions. One relay has to be driven and proved fup/down before the other can be driven down/up.

Question 20

What is a latched relay and what is the purpose

Answer 20

It is a relay that is magnetically latched and has a memory storage function remaining in the last operated position.

Question 21

Whats the purpose of the WJR

Answer 21

To prevent the points being called if there is bobbing of track circuits.

Question 22

What are NOLR ROLR and what are their purpose

Answer 22

Over lap relays. Providing setting of points to an alternative route should the overlap be clear and the points free to move.

Question 23

What is a lock out

Answer 23

when both lock relays are down at the same time, meaning the WZR is also down.