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The ideal is to switch polarity of the frog at the same time as the turnout. That way you don't depend on the contact of the turnout blade to conduct power.
QUOTE What if you've already fixed your track to the board? Getting at the frog may be a little tricky, so can I solder to the heel ends instead or won't that achieve anything?
Thats not going to achieve the same results Dave. Having said that my last layout had 122 turnouts and seven double slips and they all functioned perfectly for years with the odd clean. So if it's a lot of hassel stick to whats working. The next layout will have polarity switching, and probably block detection as well - but thats another story. Moral of the story if it works let it alone. Agood track cleaning car, and a mini vaccum cleaner can be a good investment.
 
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