I HATE Trainz, in all its incarnations. Don't get me wrong, when I got Trainz 2006 (saw it cheap in Smiths) I thought it was 'ok', but I can't believe I've wasted my hand-earned dosh on both 2009 and 2010:EE. So full of bugs I'd have thought it was made by MS!!! More crashes than a stock-car race. Half the built-in scenarios and sessions don't work, the frame rate is slower than a 1950's TV and the realism is non-existant. I won't even go into the trying to create your own layouts! Oh, and half of the stuff you download off their 'Content Manager' is faulty and doesn't work.
On the other hand EA Rail Simulator - top banana!
Lots of cheap or free downloadable content that works, descent graphics, and an all round better look and feel (IMHO).
Not got too far with BVE, but will report back once I've given it a good play!