drop track 18v AC voltage to ACC 14vAC voltage??

Why do you want to drop the track voltage?

 

If that's really what you want to accomplish, a resistor isn't the answer.  I'd consider using diodes.  If you expect 6A maximum track current, 14 6A diodes will do the trick.  Connect 7 in series one way, and 7 in series the other way, and then parallel these two strings in series with the center rail track power.  You'll get about 14 volts on the track.

 

Personally, I think there are a lot easier ways to trigger signals.

If I understand you correctly, have you considered a separate power source set to 14 volts for your signals? As gunrunnerjohn stated there are easier ways of doing things. He probably has one that is even easier?

You could also try something like this which is 4.95 from Ebay that will adjust your voltage according to what you set them at.

 

 http://www.ebay.com/itm/161045...e=STRK%3AMEBIDX%3AIT

Uhh, that's a 1A maximum output, not to mention that it puts out DC and not AC.

 

My apologies I meant It more for an example. I use one to run LEDs but the company does make other options if you didn't want to make your own

Taking your question at face value, what GRJ suggests about using diodes (vs. resistors) is the expedient solution.

 

But as everyone is alluding to, if this is for block signaling, there might be better ways.  Perhaps you can share a bit more about what kind of signaling devices you're using.

 

For example, using a DC supply for signaling circuits can be cheaper, simpler to hook up, and use less power.  Many (most?) signaling heads now use LEDs (DC) instead of incandescent bulbs.  All circuitry that does the "neat" signaling stuff operates on DC.  But it depends on what you have and what you're trying to accomplish.