Rails

One-way tracks on which mine carts magically appear to transport resources between buildings.

Base Cart Speed it 26.66 items/cycle (1.5 seconds for an item to move one tile, 40 seconds in a cycle).

Cart Speed can be increased through Infrastructure Upgrades: Cart Speed can be increased by upgrading the City Core, +20% Cart Speed per level.

Enemies will never attack rails.

Splitting rails:
Splitting rails will alternate each time going each direction, guaranteeing a 50/50 split. Buildings that draw from rails directly will grab every item that passes them that it needs. If a split happens before the input to a building, the 50/50 split will prevent the building from getting all items. This can be very helpful for unprocessed goods that are in limited supply (like acid) or half processed goods that require additional buildings (like Carbon).

Example 1: a map has 3 acid nodes, and you want an equal amount of acid going to Avid Wood and Acid Stone. Build a rail form 1 acid nodes each directly to your wood and stone processing buildings, while the 3rd node's rail splits with each part going to meet the supply rail for your stone and wood processing respectively.

Example 2: this map has many carbon plant nodes, which need to be processed by wood warpers, and you wish to evenly split carbonized crystal and food production. Have all wood warpers output onto the same belt, then after, have the belt split towards food processors and stone production.