Hi Ken,
I'm running Trainz TC 1 & 2 on a MacBook Pro 2.16 with an ATI1600 video card. I found boot camp is about the best, runs great with the sliders maxed.. I tried VMWare Fusion and while it ran 2004 alright, TC ended up more of a slide show. The video drivers leave a lot to be desired from VMWare, only an SVGA driver and you have to split your video card.
The other emulators for non intel Macs are much worse. Way to slow except for simple games. I will admit it's been a while since I checked though.
There was a Mac version of Trainz in Beta several years ago. I guess it's been dropped some time ago. Shame though, would have been great to have a native version, I hate booting into Windows just to get my trains fix, but with the Intel chips we probably won't see one.
Dave......