ATi Radeon 6970 2gig, P67A-UD3P-B3 Gigabyte motherboard, 8gig of DDR3 1300 memory and TS12 Runs crap jerks etc. Ive tried GL and Directx even taken my res down to basic. Must be something wrong with my set up but don't know what. All other Sims FSX. Flightgear, Total War run great ???? Stumped.
There are a bunch of things to try:
Update your video drivers to latest graphics drivers as well as download DirectX 9. Also update any system drivers. Now I admit I'm not that familiar with the specs of the AMD video card line, but I'm sure your card series is pretty up-to-date.
Disable any unncessary background tasks such as chat-notifiers, Skype (a big system hitter), video players, file-sharing downloaders, etc.
Try operating the program offline with your firewall and antimalware program disabled.
Disable Windows Search, which can make even the fastest i7 run like a DX2-50 '486!
Clean your system of old temp files and defrag your hard drive. Trainz reads a lot of data off the hard disk while it's working. Fragmented drives will cause a lot of pauses as the data is searched for on the drives.
Ensure your system fans are clean and your system has adaquate ventilation. Blow the old dust bunnies out. It doesn't hurt. A warm system will throttle back as it gets hot, and cause stuttering.
Check these things out and let us know how things go.
John