Thanks for the views expressed in the above three posts. It seems that, for the ordinary Trainz user, TR2012 is good enough. It does some funny things now and then, like bits of track vanishing mysteriously, but then I go for very long routes which probably sometimes confuse the software. Certainly I find that stutter is rare, I don't enable shadows and I don't care if trees wave (some do in tr2012). The main improvement I would like to see is the enforcement of better labelling and descriptions in the Content Manager. Oh, and the "unable to plot path" message to indicate the particular consist and a way of clearing the messages when they've been read.
Excuse me, 16:10 container train is due out.