päälinjoja
Päälinjoja is a Finnish term that refers to the main lines or backbone routes within a system, serving as its essential spine. The concept emphasizes the principal connections that carry the majority of traffic, data, or energy and on which secondary lines depend. In Finnish planning and engineering language, päälinjoja are distinguished from secondary lines or branches (haara- ja sivulinjat) and are treated as priorities for capacity, maintenance, and resilience.
In transportation and logistics, päälinjoja typically denote the backbone routes of a network. In rail, they
Beyond transport, the term can be applied to other systems with backbone structures, such as electricity grids
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