Well, first of all you need to tell us what video card you are using. That would help us to give further advice. The version of the driver you have now appears to make it an NVIDIA card.
If it is indeed an NVIDIA card, then you need to visit the NVIDIA site and put your video card in the search box so that it can determine which driver installation executable for you to download. Then, install it.
EDIT: You also need to tell us which Operating System you have (the NVIDIA site will also ask this) and which version of Trainz.
Further edit: For Vista Home Premium, 32-bit, my NVIDIA drivers are 7.15.11.7568 on a GeForce 6150SE nForce 430
Bill