Ok a few from me:
- Don't use the undo button to delete a spline, chances are TRS will crash
- Where possible, lay your track in the direction the trains will be travelling. This helps the AI as it "prefers" track which is laid in the direction of travel. For the same reason, do not use double track as a) it makes the AI think it's travelling the wrong way and b) it makes curves very difficult to build (and for certain countries it's the wrong spacing anyway)
- Leave the signalling till last, as laying a signal and then laying more track ahead of it can cause problems with the AI.
- Trackmarks. If you have a long stretch of track or you find the AI constantly takes the wrong route at a certain location, lay a trackmark down on the path you want the AI to take and then tell your trains to "Drive Via". I find that placing a trackmark a full braking distance before a signal and telling a train to "Drive Via" prevents the AI from trying to take control of points which are beyond the signal and it will instead wait for the signal to clear.
- Choice of track. Experiment! There are thousands of different types of track available in TRS and on the DLS. It's sad to always see people putting so much effort into the rolling stock, scenery and buildings used on a route and then to have the visual effect of all that ruined by using the default tracks which were built-in to the original Trainz and have been available for six or seven years now. Surely I'm not the only one who thinks this?
There are plenty more but I'll leave that to the others
Cheers,
JB