Underground belts

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Items

File:Transport-belt-to-ground.jpg

belt-type	factor speed	speed (tiles/sec)
File:Basic-transport-belt-to-ground.png Basic underground belt	1	1.875
File:Fast-transport-belt-to-ground.png Fast underground belt	2	3.75
File:Express-transport-belt-to-ground.png Express underground belt	3	5.625

Related: Transport belts, Splitters Nearby: Inserters, Storages

Basic

Task: you need to cross another belt, pipe, or any other entity; not more than 5 tiles.

• select underground belt and make sure, it is in the right direction (press R until it is)
• place the to entry-section
• the underground belt keeps selected but it has changed into the exit section
• place it in the direction of the entry, not too far away.

Note: Rotation key (R) can also be used to invert tunnel flow of placed underground belt.

Advanced

Behavior

For a more founded introduction into the belt mechanics see Belt transport system.

Underground belts can be used to cross different flows of items without interfering. They move items like a normal belt.

File:Split-swap.png

You can turn the order of the lanes or split the lanes completely with the underground belts trick

• You can cross any number of entities and all types of ground, like water, swamps, etc. (input and output of course over water)
• You can cross other underground stuff (any number of underground belts or underground pipes). They won't be mixed.
• For the connection only the endpoints (entry-side and exit-side) are relevant.
• The maximum distance underground is 5 tiles.
• An underground belt pair with a blocked output stores up to 20 items. (Per lane? Untested!)
• If you mine an underground belt, up to 20 items are recovered, the remaining items in the underground are placed into your inventory.
• The half of the underground belt tile with a belt can accept input from the side. The other half (with a tunnel entrance) blocks incoming items.

This last fact is important, because it can be used to do some tricks.

Much more uses

• Underground belts/More uses

This explains in detail the splitting lanes trick. This is a very useful "misuse" of the underground-belt output. See right!

• Three belts in two tile-lines
• Two belts in one tile-line
• Join two lanes into one

See also

• Transport network
  • Transport belts
  • Splitters
• Crafting network

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