Hi Jake,
Thanks for the input. Yes, I have a ZW-L . I think you came to my open house last year?
Any-who, not sure if the ZW-L would cause any whistle issues. I had a prewar Lionel switcher 1656 on the track with the ringing bell. After about 4 minutes it stopped ringing. Not sure if it was related to my new power source or not, but I will have to take it apart and see what happened.
I was curious if the newer transformers cause the older locomotives to run a little louder?
Well on the hunt now... I may start with the 224e with the 2224 W Die Cast tender and work my way up!