Two Position Signals Flashcards
What Aspect colours mean on three signal. Yellow red green
Can you self authorise to pass a automatic signal at stop? If so under what authority?
Yes and rule 1 section 3
What does type mean in regards to signals?
Types of signals means identifying the physical construction of the signal. Two position has light and disk. ( how it looks, bright light, target that moves.)
What does class mean in regards to two position signals? ( 7 types)
Means different types( abilities). Two position signals have 7 types
1. Disc
2. Dwarf (alone)
3. Dwarf (sidings)
4.home
5. Calling on
6.distant
Two position home signals are fixed at and protect? (5 things)
Stations
Signal boxes
Sidings
Level crossings
Junctions
All two position home signals in metro network are light type. The home signal can show red light for stop or green light for proceed.
Home signal at stop and proceed. Ptsn for both
What is a distant siginal
Are used as an advanced warning of the home signals. It displays
Caution/yellow (one of next two home signals could be red) and proceed / green ( next two lights will be green). The only distant siginal in metro is on the up approach to Frankston from Long Island junction.
What is a “calling on “ signal attached to ? And what is if for
It is attached to a two position home signal. It’s used for allowing a train to enter an occupied railroad when the track section is circulated. It only applies to the same track as the home signal above/ it’s attached to
A disk signal can be a type and class. What two aspects do they display? And where are disk signals used to control train movements? Same as dwarf
Stop/ red
Proceed / green
Two position signals operate by showing one of two aspects. What does home, dwarf, and disk signal display?
Stop
Proceed
Two position signals operate by showing one of two aspects. What do distant signals display?
Caution
Proceed
Two position. Siding dwarf and call on signals display
Normal
Proceed
Common purpose
Disk signals are used to control train movements from? 4 answers
Running line to line
Running line to siding
Siding to siding
Siding to running line
Disk signal at stop position. Ptsn
Red disk by day. Red light by night. Stop also called danger
Disc signal at proceed position. Ptsn
Turned to the side by day. Green light by night.
Two position dwarf signal are used to control train movements from? 4 things. Same as disc
What colour is the light on a dwarf siding ( fitted on 2 position home signal with a sign indicating siding) for proceed?
Yellow for proceed. Also The light will be extinguished when in normal position .
There must be a board with a sign that have sidings written on it. When you see dwarf signal on the same post a home signal it must say sidings and it is for shunting movements into sidings only
Light type dwarf signal at stop. Ptsn
The two position light type dwarf display two aspects. Stop and proceed
Light type dwarf signal at proceed. Ptsn
Light type sidings dwarf. PTSn at normal aspect ( no yellow, just blank/black empty) and at proceed ( indicated by yellow light)
Sidings dwarf signal only applies for movements to the siding and not to the same line as the home signal directly above or beside it
There can be more than one Two position signals of the same class on the one signal post. Two position signals, whether Home, Dwarf or Discs can be located on the same signal post. Each signal will take you to a specific location. It is important for the driver to understand where each signal goes to avoid wrong routing. Each signal has its intended location indicated on the relevant signal diagram. How are they read?
When multiple signals are fitted to the same post the signals are to be read:
• Top to Bottom then Left to Right.
Any time that two signals on the same post are displaying Proceed at the same time, it must be treated as an irregular signal aspect and the Driver is to treat both signals as at their safest aspect.
