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[[File:Chain_Signal.png|200px|thumb|left|A Chain Signal in Realistic View]]
<!--[[File:Signals all.JPG|400px|thumb|left|The Three Different Direction Configurations of Block Signals]]-->
===Purpose===
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==Block signals explained==
Block signals allows access only on the blocks which are not occupied by other train. Block is the space of railway between two signals. You can see the block status with the arrows pointing towards the segments. Red arrow means that the block in the arrow direction is occupied.<br>
