I have a 1954 Model 2055 Lionel locomotive with the whistle in the coal tender. Last year the original transformer broke and I had to by a new one.  I also bought new track (Fasttrack).The train store guy recommended a Lionel CW-80 transformer.  The train runs fine but the whistle does not work.  I had the whistle tested at a train store and it worked fine there, so the problem seems to be with the transformer and/or the track.  Any ideas on what is causing this or how to fix it?