A 3m track laying guide with 4.5 meters in between track centers, just place and lay your tracks along the red lines, 3m is a short one mostly for keeping distances while going around corners, this will keep your tracks an even distance apart. That is if this has worked right and I have gotten the mesurements correct. To use, just lay down one track where you want it, then place this at each spline point, rotate and line up the rails to the 'red' marks, then follow with the second track placing spline points at each mark...:)
You'll find this under the scenery in Objects listing in Surveyor.