Oh, also, I DO recommend running through the UKTrainSim post here:
http://forums.uktrainsim.com/viewtopic. ... 7#p1466437It really did help (a little disappointing, yes) but by using it, I successfully tweaked my program to
smoothly and
consistently run at 30 fps - not just with free roams anymore, but on most scenarios. (The second "Fire' scenario on HSC excluded...still getting a max of 14 fps on that). Pretty cool! Now its actually FUN!
Here's what works best with my computer:

A little disappointing (as I really liked those shadows), but playability is much more important.
Again, computer specs:
Toshiba X505 LAPTOP
Win 7 64bit
i5-430 2.6mhz Processor
Nvidia GTS360M 1gb Dedicated Graphics
8 gb Gskill DDR3 1033 ram
2 500gb 7200 rpm Hitachi drives