Some points are already discussed in other threads, so i’m giving you a short answer:
1. We’ve got Highspeed trains.
2. No Monorails at the release.
3. No H-Bahn at the release.
4. No underground train stations / Metros at the release.
A lot of the features are planned for DLC’s or Train Fever 2. We haven’t got the resources to implement them in Train Fever at the level we’re expecting it to be.