Yes, So I can't place diagonal train stations, so I would have to convert it to straight somehow, that can cause multiple issues. Its probably possible to write logic for the potential issues, like an 8-way diagional and train stations overlaping other rails. But atm you have to put some straight rails manually at the end of your intersection before testing.
1. Place the intersections down.
2. Add some straight rails to your diagonals headed the same way for each cardianal direction. Like the same in and out should be from the same direction.
3. press the Rail button, to add stations.
4. Start