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[quote user="7j43k"]This is true if you have one BB locomotive. If you have TWO BB locomotives and you MU them, you have a 50% chance of shorting the rails through the couplers and coupler boxes IF there is not an insulator intervening. Perhaps BB frames have been modified to forestall this problem. Ed[/quote] Ed, The new blue box or "RTR" this appears to be the case.  The ones I have are equipped with plastic coulper boxes, but it would not hurt to check for continuity between your coupler and wheels before testing this statement, as I have only three RTR locomotives (albeit they are different models and have widely separated dates of assembly).
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