All stations are placed and debugged. We still need to add the terrace and stair cases to the outside. If you would like a substation placed further down the line teslas has made a post
explaining the required materials. Once we have the materials the station will be dropped-in and configured. Everyone should feel free to build offshoots from the sub-destination rails, just don't go crazy. Zanetheinsane will update the instruction manual for the trains system soon.