Large tube used to join two modern stations or a lunar bases (13,5 m in diameter and 124 m long) with 5 m inner sidewalks or pavements acting like platform (with AJS Station for passengers). You may join many tubes. It is better in surveyor to put tracks and catenaries or maglev before and the tube after it. I will multiply objects for this kind of stations and you can do it. See for more objects http://trainz-fr.blogspot.com