Noise Sensitive Zone

Hi All, thought this was a bit strange that when we had our Mini meet last Sunday we stopped near a mini railway station museum. This sighn was out front, strange thing is it says it all but what was going on at the time was a bloody small steam train running around inside tooting it's whistle and making lots of noise so why do they have this sighn stuck out front???
Cheers
John
BBJ


Cheers
John
BBJ