Not sure what to do with my PW-ZW

You could reverse the wiring going to the rails (provided that won't interfere with other wiring from other transformers). If you have U going to the outside rail(s), switch it so U is going to the center rail.

The postwar tender whistle relays weren't polarity sensitive, so your 2037's whistle tender should work regardless of how the wiring from the transformer to the rails are hooked up.

Hope this helps,

J White

It would be prudent to check the wiring for the whistle control. Schematic attached.

I'm going to try that. My biggest issue is my remote switch tracks. I'm not sure if switching the wires will be that simple without having to rewire them.

Thanks, I printed the schematics. It's been a while since I actually looked at one. Going to have to do a refresher on the symbols.

If my memory serves correctly, the new selenium rectifier discs sold for use in the PW Lionel transformers generate a DC voltage of the opposite polarity from the original copper oxide rectifiers. This makes no difference when running PW equipment, as the whistle relays are not polarity sensitive, but it will indeed reverse the bell and whistle functions on newer equipment. Jeff at The Train Tender has some "polarity reversal discs" that will let you reverse the new rectifier discs to return the whistle control to the same polarity as the originals. Give him a call.

This of course assumes that your transformer has the new rectifier discs installed. 

You can make an external controller,shown here

LINK

The bell rings most likely because the transformer leads are reversed.

Dale H

They are selling the wrong ones, then. The anode-to-case diodes work properly.

Well it's turns out when the transformer was rebuilt, the wires were reversed in the transformer. I have a friend who is a Lionel tech that's going to fix it as well replacing the disc with a diode. The sad thing is he's the last of his kind. Lionel isn't doing the classes anymore.