Package of 2 white metal cast track crocodiles in HO scale (1/87).
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Before each signal you will find this element in the centre of the track which is used to repeat the signals in the cab.
Underneath the locomotive is a wiper which gives a pulse on the top part in a zig zag shape, hence the name "crocodile".
We therefore advise you to associate a crocodile with each light on your layout.