float width = max(max(-ballast_min.x, ballast_max.x)*2, gauge+(rail_max.x-rail_min.x)*2)+0.004;
float height = ballast_max.y-ballast_min.y+rail_max.y-rail_min.y+0.01;
float width = max(max(-ballast_min.x, ballast_max.x)*2, gauge+(rail_max.x-rail_min.x)*2)+0.004;
float height = ballast_max.y-ballast_min.y+rail_max.y-rail_min.y+0.01;