For laying multi-track tracks - you ensure the mutual distance and concentricity of the tracks.
Slide the H-segments onto the rails. You put them denser in curves, larger distances are enough on the plane. You screw the rails or glue the CA with Hacker glue to the subsoil. You take off the distance H and use it for laying other tracks. Distances are available for TT pitches. The set contains 12 H-segments.
On the I-Track overhead tracks and the Rondela spiral climb, you ensure that the tracks are positioned correctly using the I-Track Spacers R. Slide the R Spacers onto the tracks and press them onto the I-Track segment. You put them denser in curves, larger distances are enough on the plane. You screw the rails or glue with CA Hacker glue to the track-bed. Lift the R Spacers and use them to lay next tracks. I-Track Spacers R can be used for both "flexi" tracks and track with bedding to ensure the correct track position. The set contains 12 Spacers.