What is two-aspect Signalling?
A warner signal is used only in two-aspect signalling (2LQ, MLQ, 2CL). Its purpose is to warn of an approach to a stop signal further ahead, or to advise a driver of the condition of the block section being entered.
How many types of signal aspect are there?
There are three systems of colour-light signalling in use. (In IR terminology, the term Multiple-Aspect Colour-Light signalling includes both 3- and 4-aspect signalling, and 2-aspect signalling is usually treated as a variant of 2-aspect semaphore signalling. Hence the classification below is not the same as IR’s.)
What is a signal aspect?
The aspect is the visual appearance of the signal; the indication is the meaning. In American practice the indications have conventional names, so that for instance “Medium Approach” means “Proceed at not exceeding medium speed; be prepared to stop at next signal”.
What is IB signal in railway?
i) “Intermediate Block Post” means a class ‘C’ Station on a double line, remotely controlled from the block station in rear. ii) “Intermediate Block Signalling” means an arrangement of signalling on double line in which a long block section is split into two portions by providing an intermediate Block Post.
What are three and four aspects of colour light signals?
A colour light signal capable of displaying four aspects. From top to bottom the lights are yellow, green, yellow, and red. A red indication means that the next section contains a train. A single yellow indication (using the lower yellow) means that the next section is clear but there is a train in the following one.
What is IBS signal?
Intermediate block signalling (IBS) is a technique by which a block section between two adjoining stations is split into two by the provision of an additional signal which is remotely controlled from the station.
What is block station?
: a place at which railroad manual block signals are displayed.
What are the two types of communication signals?
Communication Systems
- The communication system is a system which describes the information exchange between two points. The process of transmission and reception of information is called communication.
- (1) Analog.
- (2) Digital.
- Wired (Line communication)
- Wireless (Space communication)
- Information.
- Signal.
- Transducer.
What are the different types of rail systems?
There are three distinct railway systems:
- Surface railways.
- Elevated railways.
- Underground railways.
What is double yellow signal?
YELLOW :- Means PROCEED with a Maximum permissible speed not exceeding 15kmph. 3 DOUBLE YELLOW:- Usually it means PROCEED and with reducing your speed slightly as it is most likely that you will encounter a yellow in the next section.
What signal represents a caution aspect?
yellow aspect
A yellow aspect (Caution) tells the driver that the next signal can be red (Danger) and that they must slow down in preparation to stop at the next signal. The next aspect will be red (Danger) unless it changes as more the train’s route is clear or the Signaller sets the signal to caution.
What speed do you pass green aspect?
Flashing green – flashing green aspects are employed on the East Coast Main Line north of Peterborough. They were installed for 140 mph (225 km/h) running in connection with the testing of the new InterCity 225 electric trains, with a steady green limiting test trains to the normal speed limit of 125 mph (200 km/h).
When to use 2 aspect signal control system?
1. 2 ASPECT SIGNALLING IS BEST SUITED WHERE THERE IS AN INFREQUENT TRAIN SERVIE LIKE FREIGHT TRAIN SERVICE. 2. IN 2 ASP. SIGNALLING, A ‘RED & GREEN’ STOP SIGNAL CONTROLS ENTRY IN TO A RELATIVELY LONG BLOCK SECTION.
What are some examples of two aspect R-G signals?
An example of two aspect R-G signalling in a three aspect signal is at Newhaven Harbour, NH5, where the signal is either Red or Green when going down the branch (subject to a fixed distant further down towards Seaford IIRC) and the only time a yellow is shown is when they are going into the (dead end) Marine platform.
What is the difference between two aspect and mechanical signals?
As a general rule two aspect signals replaced mechanical signals on a like for like basis. In other cases, a line of route may be resignalled from new with two aspect (home and distant) signals, the Home displaying only red/green and the distant only displaying yellow/green.
What type of signalling is used on railway lines?
The type of signalling (two, three or four aspect) used is a function of the maximum speed of the line, distances between signals and the number of trains that it is required to run, and how close behind they will be (Headway). This will then be the factor that determines which type is installed.