dubbelspoor

Dubbelspoor refers to a railway line laid with two parallel rails, one for each direction. The arrangement allows trains to travel in both directions simultaneously on the same corridor, improving capacity and reliability compared with a single-track line, which requires trains to wait for crossings.

In practice, dubbelspoor can be continuous along a route or consist of sections where two tracks run for long distances and are separated by zones of single track with passing places. It requires signaling and interlocking to prevent collisions; on modern networks this is achieved with centralized control and interlocking systems, track circuits or axle counters, and sometimes cab signaling or ETCS.

Benefits include increased capacity, higher frequency of trains, reduced delays, and the possibility for overtaking and faster services. Limitations include higher capital and maintenance costs, land use, and complexity of construction in urban areas.

In the Netherlands, dubbelspoor is common on major lines, enabling high-frequency regional and intercity services. Upgrading single-track corridors to dubbelspoor is a common method to relieve congestion and improve reliability. Some routes may still operate on single-track sections, using passing loops to manage traffic.