ZW whistle control problem

Does anyone know if using very thin guage telephone wire(copper)to connect my ZW to the track will cause my postwar and Williams trains’whistles and horns to sound intermittently? I used the thin guage wire and everything was great until I ran the trains for a while. Then the trains would pick up speed and no whistle or horn sounds were produced. Is the wire, my ZW, or my engines the cause? Thanks and Happy New Year.

I don’t know what caused the whistle problem; but the (postwar) ZW has a 15-ampere circuit breaker; so using anything smaller than 14 AWG is asking for trouble, in the form of a fire. For example, 24 AWG is good for only about 2.5 amperes.