3 Position Signals Flashcards

Question 1

Q

Question 2

Q

What is axle counter technology?

Answer

A

It counts the number of train axle wheels entering and exiting track section to change automatic signals

Question 3

Q

What type are all three position lights on metro track?

Answer

A

All light type

Question 4

Q

What are the three class types?

Answer

A

Home
Automatic
Dwarf

Question 5

Q

Who are home signals controlled by? And the three position home signals are fixed at at protect what 5 things?

Answer

A

Controlled my controller
They protect -
Stations
Signal boxes
Sidings
Level crossing
Junctions

Question 6

Q

Do you need authority to pass a home signal?

Question 7

Q

What is the purpose of automatic signals?

Answer

A

Automatic signals are signals whose primary purpose is to expedite the passage of trains by dividing a long section of track into shorter sections.

Question 8

Q

Can an automatic signal be passed in the stop position?

Answer

A

Yes, read how below photo

Question 9

Q

Dwarf signals are signals that are controlled by a signaller, it displays one colour light at a time. They control train movements from? 4 things

Question 10

Q

What does absolute signals mean and what type are they? Also what does permissive signals mean and what type are they?

Question 11

Q

What colour lights (aspects) are the the home and automatic signals? Also what colours (aspects ) on the dwarf signals?

Question 12

Q

Types of colour (aspect ) combinations on home and automatic

Answer

A

All same combinations except a home signal that’s low speed caution (red red , little yellow) are the same

Question 13

Q

3 position signals. Clear normal speed. Light (aspect) colours and Ptsn

Question 14

Q

Normal speed warning. Colours(aspects) and Ptsn

Question 15

Q

Reduce to medium speed signal lights (aspects) colours and Ptsn

Question 16

Q

Clear medium speed. Aspect ( colours) and Ptsn

Question 17

Q

Medium speed warning (colours) aspect and Ptsn

Question 18

Q

Stop signal. Aspects(colours) and Ptsn

Question 19

Q

Low speed caution aspects (colours) and Ptsn

Question 20

Q

Low speed caution light (red, red, small yellow) can apply when?

Answer

A

See photo below.
Also on test low speed caution signal can never be used for train movements into a bi directional portion of track. Also the low speed caution is not affected by the track circuit therefore enabling a second train to enter the already occupied section.

Question 21

Q

Three position signal sequences

Answer

A

Signals can only get better not worse. See photo

Question 22

Q

What does it mean when a three position signal has an illuminated 65 or 80 figures?

Answer

A

This indicates to the driver that the points ahead are high speed points ( train can go quicker bc points are newer) instead of the normal 40kmp enabling them to be traversed at a higher speed.

Question 23

Q

Clear medium speed ( red over green aspects) with an illuminated 65 or 80 sign. What is the Ptsn?

Question 24

Q

Red Illuminated Letter “A” On a Three Position Home Signal. Why are they displayed?

Answer

A

Illuminated Letter “A” lights are displayed as an additional light, attached to a Home Signal.
The Illuminated Letter “A” will only display when the signal displays a Stop aspect.
An Illuminated Letter “A” light informs the Driver.
• •
The points for the Home signal that it is attached to are set for the mainline That the signal is now operating in automatic mode (via the passage of trains)
The rules that apply with regards to passing it at the Stop position are now the same as an automatic signal.
This occurs at locations that may have stabling sidings, or where trains may terminate.
At these locations, it is only necessary for a Signaller to be present if a train is going in or out of service or required to terminate. It lets you know the signaller that controls this signal is not present. You need to call area controller for permission to pass stop