A track piece that gives a switching pulse when a train passes, for example to switch a signal or turnout. On Märklin the pickup shoe presses a switch for this.
Märklin C track 24994 (straight, 94.2 mm) and the curved switching tracks 24194 (R1, 15°) and 24294 (R2, 15°).
Märklin C track: articles, geometry and the track planner