I think several. I know one of them is brighton mainline. Some are more like general suggestions such as having a true high speed route where you go fast for a while and an ice1 (kassel wurzburg). Some people wanted an older german loco (nwagen & 110) which came with bremen oldenburg which I don't think was suggested in the forums. Idk about others since I haven't been a member of the forums before tsw first released.