Hi Val
Build 106618 is an older Trainz Plus release, and so you should have a couple of updates available for this.
You may need to change your patch stream to 'Trainz Plus' or 'TRS19', depending on what your current access is. This can be done by following these steps:
1) Double click on the TRS19 icon on your desktop
2) Click on Trainz Settings
3) Click on the 'Install' tab
4) Click on 'Change Trainz update stream'
5) Follow the prompts till you see the 'change update stream' option, then click on this
6) Click on the drop down list, and click on the patch stream you require, then click on 'ok' and 'done'.
If no patch shows automatically, then click on 'check for Trainz updates' in the same tab, and follow the prompts to install the available update.
You may need to install two or so patches to get to the latest build. The latest build is currently 110491, however we are currently expected TRS19 SP3 to become available in the next week or so.
Regards