Which method is used by Indian Railways for interlocking branch lines?

The term ‘slotting’ is used for electrical interlocking between signals as well. Tappet Locking is a system used to prevent signals being pulled off for conflicting routes.

How do trains not hit each other?

Trains cannot collide with each other if they are not permitted to occupy the same section of track at the same time, so railway lines are divided into sections known as blocks. In normal circumstances, only one train is permitted in each block at a time. This principle forms the basis of most railway safety systems.

How does a railway signal box work?

Signal boxes on the railway control not only control the signals – which tell the driver when it is safe to go – but also the associated points – and the two have to be interlocked so that it isn’t possible for a signal to indicate that a train must go in a certain direction while the points are set for another.

What are the principal of interlocking?

– The basic principles of interlocking may be laid down as follows :- 1. It shall not be possible to take “off” conflicting signals at one and the same time. 2. It shall not be possible to take “off” signal for the running line until :- (a) all points on the running line are correctly set and facing points locked.

How many railway signal boxes are left?

But fewer signal boxes still work as part of our signalling systems. At the end of 2019, there were 166 listed signal boxes on our network, including 86 still in use. Needs to modernise signalling for more reliable journeys mean we’re increasingly moving controls to state-of-the-art Rail Operating Centres.

What is a power signal box?

Doncaster PSB (Power Signal Box) is a signalling centre on the East Coast Main Line (ECML) railway in the United Kingdom, principally covering the line from London to Edinburgh but also encompassing other lines diverging and converging to the ECML.