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I have a pair of manual Marx switches with the tin green/red signals.  I replaced a straight on my track with a switch.  I rolled a car thru just fine and dandy.  when I sent my engine thru, it lost connection in the middle and then tried to run backwards and then just stopped.  there's a dead spot in the middle of the track where the switching takes place.  is there a trick to these like you have to add extra power to the middle of the switch somehow??  thanks, jeff

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There is a very delicate copper leaf contact under the swivel rail at the foreground of this picture that is "live" with the center rail power.

 

This leaf contact is supposed to make contact alternately with the underside of the rivets(the two closest in the foreground) in the swivel rails(straight & curved) as they swing into position for conducting the center rail power through the switch.

 

It's not uncommon for this copper contact to be oxidized or contorted to the point that it does not make proper connection.

That little copper strip is your electrical short issue - it can come in contact with the base of the switch.  The quick fix I learned long ago since I've pretty much used Marx O27 switches on all of my layouts, is to get a thin piece of cardstock (like an index card) and cut out a piece to fit under the strip (i.e. between the strip and the base-plate) - about 3/4" square should do the trick - and slide it in place.  

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