Model railway hobbyists who want to trigger train-controlled switching operations depending on the direction of travel often have things easy with systems such as Marklin HO or Miniclub Z gauge, since the corresponding switching track sections can be actuated individually in both directions. Things are different with other systems, such as the Marklin Maxi/1 gauge. Here it's necessary to use selective switching hardware for this purpose. A popular approach is to use reed switches together with permanent magnets fitted to the bases of the vehicles. Unipolar and bipolar Hall switches can also achieve the same objective. However, a permanent magnet must always be present on the train to act as a trigger element.
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