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Reply to "3 Rail DCC O vs 2 Rail DCC O"

Being new to all this I am confused?  I come from HO (2R DC).

Do they actually make DCC systems designed for 3R which is traditionally uses AC?

Or is this only for equipment (Locos) that has DC motors (like everything I have bought so Far)?  Do you then "gut" the existing Loco electronics and install a DCC Decoder upstream of the center pick-up side of the motor.  Then take the other motor lead and Direct attach it to the chassis.  Then it would work and use the same system as 2R DC/DCC (pulse width modulated)?

Some one please let me know?  Thank you!

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