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A bracketed section of a drawn track line.
Also known as: Detection section symbol, Circuit limit marks
A signalling diagram symbol marking the extent of a track circuit, the electrical section by which a train's presence is detected.
Marks the extent of a track circuit on a signalling diagram.
Contexts: Technical drawing
Bounds the section rather than filling it, so the diagram records where detection begins and ends rather than asserting anything about the track between.
Contexts: Technical drawing
The track line marked at each end by a short transverse stroke, the pair of strokes bounding the detected section.