Converting from DC to DCC with selectable power


taylor102195@...
 

Am "converting" DC to DCC with selectable power using a DPDT to switch between DC or DCC on a small 4'x8' table layout.  The guides i have read say do not use typical DC common rail wiring with DCC.  If i am isolating the DC from DCC source do i need to do anything special with the existing common rail wire given the small size of the layout?

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