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
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
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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.