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It depends.    If the wheels with pickups on the locos are spread apart farther than the length of the frog, then they should span it and pickup from outside the frog.    If you have some short wheel base locos and using long frogs - ie 7 1/2, maybe  you need to.

It does increase reliability but by how much is opinion.  

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OGR Publishing, Inc., 1310 Eastside Centre Ct, Ste 6, Mountain Home, AR 72653
800-980-OGRR (6477)
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