In my opinion being ignored by an exhibitor at an exhibition is like being ignored by the staff in a shop. if I ask a question, I expect an answer, if they can't answer it, fair enough, no one knows everything. What isn't fair (and quite rude) is when I get completely ignored by an exhibitor, like I am talking trying to talk to a brick wall. I had a lovely experience at an exhibition a couple of years ago that I attend every year, I asked one question about a certain model, and we had a good conversation for about 5 minutes, and in that time, I got to hold the model and get a close up look at it, and every time where I went back to take photos of that layout, he would tell me something extra about the layout or some of the stock on it, in the end he gave me a flyer for the club he belonged to and another exhibition he was exhibiting at with his club. I found him a very nice man, and he was very pleasant to talk to. Even if the exhibitor has to stop the train because they can't shunt and talk at the same time, they should still engage with the public.