How to link

You can link a

• Signal (you need to click on the bottom block of the signal)
• Redstone Input
• Combined Redstone Input

with

• Signal Controller

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Or a

• Signal (you need to click on the bottom block of the signal)
• Redstone Input
• Combined Redstone Input
• Redstone Ouput

with

• Signalbox/Interlocking

Therefore you first right-click on the object you want to link and then on the block you want to link with.

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Or if you want to link a signalbox with something else, you have to shift + right-click on it.

• Signalbox/Interlocking

with

• Signalbox/Interlocking
• Pathway Requester
• Train-number Block
• Monitor Block

By using a Linking Tool or a Multi-Linking Tool.