väliasemista

Väliasemista is the plural form of väliasema, a term used mainly in Finnish rail transport but also in telecommunications. In railway usage, väliasema refers to an intermediate station or passing point along a line, typically on a single-track route, where trains traveling in opposite directions or trains with different speeds can meet or overtake. These facilities are smaller than main stations and often have limited passenger services; sometimes they have a platform or a simple loading track and the necessary signalling to regulate the passing manoeuvre.

They are strategically placed to alleviate bottlenecks and to increase line capacity and timetable reliability. A väliasema may include a passing siding, a platform, and basic customer amenities, but many are unmanned or primarily used by freight or operational trains. Signalling at väliasemista is coordinated with the surrounding block system and the railway's centralized control.

In telecommunications and electrical networks, väliasema can also denote a relay or repeater station that extends coverage or connects network segments. In such contexts, the facility might not handle passenger services but serves technical purposes like signal amplification or routing.

The term emphasizes an intermediate or auxiliary function rather than terminal service. The existence and configuration of väliasemista depend on the railway or network design, traffic levels, and safety regulations. In Finnish railway history, many väliasemat date from the early line-building era and remain in operation, have been repurposed, or have been dismantled as services evolved.