Detail of HO/O27 Crossing

This is a close-up of the HO/O27 crossing.  O27 rails were purposely blackened,
however they eventually turned to a rusted finish.

Click here to view crossing video clip, 169K MPEG.

Gargraves O gauge 3 rail flex track (with blackened center rail) is used here for
the insulated rails before and after the crossing, and another Gargraves section is used to
release the stopped vehicle about 10 feet away.
Here is how the HO/O27 crossing began.  It is Lionel O27 track and brass HO rerailer track shimmed up to 3 rail height.  Just maintain the proper flangeway for each gauge.

Please refer to hobby reference materials for correct and safe use information regarding these and all electronic circuits.  These diagrams are intended to explain how things were accomplished in theory, but it is the responsibility of the individual to locate precise information regarding electrical circuits, materials, ratings of components, etc.  Do not attempt these hobby projects, or any electrical project, if you don't have the necessary skills and experience.  The page owner is not and cannot be held responsible for fire, electrical shock, damage, or accident of any kind caused by these circuits or any ideas or information contained on this site.

This shows how the reed switch, activated by a magnet glued under the vehicle, will energize the relay,
which removes DC  from the HO rails (stopping the vehicle's motor) and applies HF AC in its place.
An insulated section of O27 track about 10 feet away will break the latching of this relay, letting the vehicle resume.

Check the "favorite circuits" section for relay labeling.

This relay activates every time a train passes through the crossing.

Here is great way of controlling traffic at a crossing using the latching relay technique.

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