I am running in a mixed Lionel/Williams environment, with a Lionel KW transformer, Lionel FasTrack and a Lionel Polar Express locomotive, as well as a new Williams GG1 (semiscale) and the Williams F3 Santa Fe diesel, also new. The problem is with horn function. The Lionel engine works OK, as does the GG1, however, the F3 bell/horn refuses to work in either mode. Does anyone have any ideas what to do?