The "dead spot" you are referring to is called the frog. The frog is isolated from the rest of the turnout to keep from shorting the turnout. The Peco turnouts mentioned above are ELECTROFROGS, not all Peco turnouts as implied. Peco manufactures two types of turnouts, those being Electrofrog turnouts and Insulfrog turnouts. Electrofrog turnouts are power routing, that meaning that power is routed only(!) to the line that the turnout is set for. If it is set for the diverging route, only the diverging route is powered and the straight route goes dead, and vice-versa. IIRC, Electrofrogs can be made to have both routes powered at all times by adding wire drops to both routes from a main bus, but require the two frog rails to be isolated with insulated rail joiners. I am going sheerly off of memory here, so I would recommend looking it up before trying it.