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After adding Fastrack switches to the club sectional layout the main track voltage seems to be limited to 14.5-15 volts.  Remove the track power jumper on the switch and reinstalled the switch.  The track voltage returns to 18-20 volts.  Using ZW transformer. 

Is this normal? 

Since this is a modular layout that goes to shows powering the switches from the track is easiest. 

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Law of conservation of energy says if you are dropping 5V at some unknown amperage- put it this way- enough to see track voltage sag, you would be smoking components. Basic power rules, power in = power out- somewhere. You cannot drop 5 volts and not heat something up. I would say your measurement is flawed as again, if it was electronic- there would be melting wires and smoke out of that Fastrack switch. So no, that's not normal, nor do I suspect that's real. Again, that track jumper connects to the screw terminals, but internally to something like #24 or even #28 internal wiring, and that would smoke if it had the ability to lower the actual AC voltage (shorting and thus seeing the resistance between your ZW and the point of track you are measuring). There is nothing in a Fastrack switch to limit voltage to the track. Internally the logic of the motor section of the switch is regulated to 5V DC from track power. But that does nothing to basic track voltage.

How many switches are you adding?  LED’s do not consume much power but all the same, they do consume power.  I have just finished building a toy train layout for an individual where one of the loops have a reversing loop in which the non derailing feature is what throws the switch automatically.  Even though this loop only contains the 2 power switches, there is some voltage drop of about 1.5 volts and when the switch throws to the required position, there is a momentary additional drop.  All of his other switches are powered by a dedicated transformer so that they are not pulling power from the trains.

Spike, I don't think the power draw of the Fastrack switch can account for this kind of issue.  The switch with the remote attached draws about 60ma for the LED's and the electronics powered by 18VAC.  It only spikes slightly when the tiny motor is actuated to move the switch points, that happens so fast that I'd probably have to connect the 'scope to actually see what that current is.

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