Absolute block signalling

Imagine you are playing with blocks, and each block represents a train. Absolute Block Signalling is a way of making sure that only one block, or train, can be on a certain part of the track at a time.

Think of a big road with only one lane. If more than one car is allowed on that lane at the same time, it would be very dangerous and accidents could happen. The same thing goes for train tracks, where only one train can safely be on a certain part of the track at any time.

Absolute block signalling works by dividing the track into smaller sections called "blocks." Each block has a signal at the beginning and end that tells the train whether it is safe to enter or not. The signal will turn red if there is a train already on that part of the track, and green if it is safe for another train to enter.

This way, the train driver can only continue if their signal is green, and they can be sure that no other train is currently in that section of the track. This helps prevent accidents and keeps everyone on the track safe!

In summary, absolute block signalling is a system that keeps trains safe by making sure that only one train can be on a certain part of the track at a time. It does this by dividing the track into smaller sections called "blocks" and using signals to control the movement of trains between those blocks.