Meldewegen

Meldewege are information paths in railway signaling that carry status information about trackside equipment—such as turnout positions, signal aspects, and line occupancy—from field devices to a central control unit or interlocking. They are an essential element of the signaling and safety system, enabling the interlocking to determine safe routes and to actuate signals and points accordingly.

The function of Meldewege is to report changes in equipment state: when a turnout is moved, when a signal is cleared, or when a track circuit detects occupancy, the corresponding Meldeweg conveys a corresponding electrical or digital signal to the interlocking. The system uses fail-safe principles: in case of a fault, the Meldeweg should indicate a safe condition and limit the operation to prevent conflicting routes.

Historically, Meldewege were implemented as simple electrical relay circuits connected to each device; modern installations use robust digital communication over redundant channels, but the underlying principle remains the same: a verified state change is reported so the control logic can react.

In practice, Meldewege are designed as redundant, monitored circuits with regular diagnostics. They may be part of a fixed interlocking or integrated with distributed interlocking architectures and may employ modern bus systems, safety protocols, and diagnostic interfaces compliant with European RAMS standards.

Examples include turnout position reporting to determine route feasibility, block occupancy feedback to prevent signal conflicts, and point machine status reporting to confirm that points are in the requested position.