So I've made a start by using a brick wall example which I found on this forum a while back, I've managed to make a decent start on this, however I cant figure out why the segments are overlapping/stretching when the spline goes in the other direction, some of my areas on site only extend say 600mm at a 90 degree angle from the main length, ill attach a screenshot and a stripped down scene file, the green line suggests where I'd like the railclone to end, and the red just shows the clipping/extended segments, any help would really be appreciated!