Automatic block signaling

Automatic block signaling is like a set of rules that trains follow when they are traveling on tracks. The tracks are divided into sections called "blocks". Only one train can be in a block at a time. The blocks have sensors that detect whether a train is in the block or not.

When a train enters a block, it sends a signal to the next block telling it that the previous block is occupied. This lets other trains know that the block ahead is already being used and they have to wait until it is clear.

Automatic block signaling also has red, yellow, and green lights that tell the train driver whether it's safe to proceed or not. These lights are like traffic signals that tell us whether it's safe to cross the street or not.

The signals also tell the train driver how fast they can go. If the light is green, the train driver can go at full speed. If the light is yellow, they have to slow down because there might be a problem ahead. If the light is red, the train has to stop completely because the block ahead is occupied or there is some other danger.

So, automatic block signaling is like a traffic system for trains that helps to keep them safe and prevent accidents. The system makes sure that only one train is in a block at a time and tells the train driver when it's safe to proceed.