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Circuits contributed by Don Vollrath.
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Indicating Polarity of Reversing Section

Use this circuit to indicate if a reversed section of track is at the same or opposite polarity from the mainline track.

This first circuit is for use of a 3-lead bi-color LED or two separate LEDs.

This second circuit uses a 2-lead bi-color LED.

Indicating Turnout Position

Use this circuit to indicate the position of your turnout. This clever circuit works on DCC because DCC has a constant voltage on the track.

This first circuit is for use of a 3-lead bi-color LED or two separate LEDs.

This second circuit uses a 2-lead bi-color LED.