Power to run railroad

Fastrack switch won't add much of a load. Your power sounds fine.

Thanks  But how many accessories can my ZW 275 run ? Alot of lights are being used I am running the Zw to  3 distribution blocks with 10 poles on each

Worst case on the bulbs is 4 bulbs per amp. 275 watts is about 15 amps, so that's 60 bulbs. Bulbs are almost constant current so the voltage you run them wont affect the current usage that much.

OK, sounds good Thanks for the help

Well, that's pretty optimistic Chuck.    The PW-ZW is really only good for around 215-220 watts continuous output.  The 275 watt rating is input power.

Oh, so it is. Thanks.

Then two things, maybe some of the bulbs are only .15 A instead of .25 A, or decrease the estimate by say 3 amps or 12 bulbs.

Your count of 60 bulbs is probably pretty safe, I'm sure some are less than 1/4A. 

I once took a PW-ZW and did a torture test on it to see what it would do.  It was the type (R) that had the closed lamination and was supposed to have a bit more efficiency.  I got 230 watts out for a couple of hours, but it was getting pretty toasty, so I quit.  The voltage drop is significant at the higher power outputs as well.