A lot of Weaver locos were available in both 2- and 3-rail. If you've got the 3rd rail pickups, then you know what version you have. The guts were tailored to the number of rails it was designed for, i.e. it's not a simple switch like Protosound 3/2. Depends on the age too. One I have my eye on has no digital control system in either the 2 rail or the 3 rail version.
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