MiniTrix 14979 Contact rail 50mm

Characteristic :

Brand: MiniTrix
Ref: 14979
Scale: N - 1/160

For triggering automatic functions by the train, reliable contact thanks to the double contact system.
The switching operation will only be triggered by at least two electrically connected metal wheels and not by insulated wheels or plastic wheels.
Length: 50 mm (corresponds to 14907).

Further explanation:

The electrical connection of the wheels is not axial, but longitudinal; that is, at least two axles are connected, as in a bogie (or a locomotive with multiple wheels). The small section of "contact track" is insulated on the left and right. When a wheel from the main track enters the contact track, it momentarily makes contact (short circuit), that is, it generates a pulse (with the voltage from the main track). You can use this to trigger something. Each incoming metal wheel will trigger a pulse (actually two pulses: one at the entry, one at the exit of the contact track).