Re the power up function of the ZW.
Please refer to the following pages of the owner manual.
Page 9 describes out of the box operations and why the B and C terminals are behaving the way they are. Page 11 describes how to control B and C remotely.
BTW, I would suggest looking over the rest of the manual. There are other features and caveats you might find useful.
Yes, random signals from radios can cause the horn/whistle to blow or on rare occasions even more bizzare behavior. Make sure there is a good earth ground for the track signal.
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