Backbone Hub
From #openttdcoop wiki
A backbone hub (BBH) is the largest type of Hub that is built in #OpenTTDCoop. It usually consists of at least 3 cardinal directions of Mainline Track, and is also usually load balanced as well. More information on backbone hubs including building them is in the Mainline Junctions guide.
Function
A BBH connects Mainline segments to each other, most often in 4-way or 3-way junction patterns.
Requirements
A BBH must be:
- Balanced - ie: each lane entering the BBH should be able to access any lane leaving the BBH
- Efficient - Trains should not have to slow down