Not to get into this endless debate too far but I think you just made a few of my points and missed a couple of other ones... A toy does not have to be for the use of children and children only. Just becuase something is expensive or delicate does not exclude it from the toy catagory. What seperates adult toys from kids toys is more often the price. But in the end a toy is a toy.
To use value or importance as an argument is greatly flawed, what about Beane (sp?) Babies. They can cost a lot so I assume you feel they are no longer toys (I can come up with endless examples here BTW). Most children would consider their Teddy Bear more important to them than you do your trains, so same argument, it must no longer be a toy?
Fair enough, the point is you do not look down at others who do not...
Well to start off the Duc mostlikely costs (and is worth) the same or more than your entire collection, and it is important, but I can get over it all and consider it a toy. It is a toy becuase I do not need it, it does not perform a required task etc, etc.. Again, toys could be meant for adults, that is my entire point. There is nothing wrong with it... It seems you are so focussed on the word toy to miss the point of other posters. Can this be true?
But if you play with model guns and knives are these not toys? Playing with a real gun is the same as playing with a real train, not a model train. If I make an accurate model of a gloc and run around going bang bang am I not playing with a toy (ok a model-toy)? So when you have a real full size train to detail and run I will no longer consider you (or will anyone else) to be playing with toys..... Until then enjoy your toys....
In the end:
-Full size real trains are not toys, full size real guns are not toys.
-Model trains and model guns are toys, again enjoy and focus on your hobby and not the opinion of others.