CP990 said:
Don't ALL model rr'ds go around and around? That's all they do isn't it?...
No, quite a few model railroads don't have any provisions for running trains "around and around" (continous running in model railroad speak). A lot of model railroads operate in a point to point operation where you trains starts from one location and ends up at another where it has to be turned or at least run around the train before it can head back.
Personally, I feel continous running is an important part of any layout, and every one I've ever built had some provision for a complete loop. But there are lots of very nice layouts out there that don't. Some are shelf layouts, others are huge monsters that fill up an entire basement.
Nothing wrong with either approach, just different ways of doing it.
Meanwhile, as for "That's all they do isn't it?" somebody needs to introduce you to the "operating" side of model trains, where you trains with a simulated purpose, picking up and dropping cars, and/or running on a schedule etc. It really does add a lot of interest to the hobby. Personally, I don't do much of that, since I get all the "switching puzzles" I need on the full size stuff, but there are plenty of model railroaders who really enjoy it.