Track search using call stack

    RFHumpRoute Scan(GSTrackSearch it, Trackside origin)
    {
        if (!IncHops())
            return null;
        RFHumpRoute ret = null;
        Trackside prev = origin, found;
        while (it.SearchNextObject()) {
            if (!(found = cast <Trackside> it.GetObject()))
                continue;
            RFHumpMarker marker;
            Junction junc;
            if ((marker = cast <RFHumpMarker> found) and marker.HumpTrack >= 0) {
                if (marker.HumpTrack > 0) {
                    ret = new RFHumpRoute();
                    ret.TrackNumber = marker.HumpTrack;
                    ret.MarkerId = marker.GetId();
                }
                break;
            }
            else if (junc = cast <Junction> found) {
                int dir = GetJunctionDirectionToObject(junc, prev);
                if  (dir == Junction.DIRECTION_BACKWARD) {
                    ret = new RFHumpRoute();
                    ret.JnId = junc.GetId();
                    ret.Left = Scan(junc.BeginTrackSearch(Junction.DIRECTION_LEFT), junc);
                    ret.Right = Scan(junc.BeginTrackSearch(Junction.DIRECTION_RIGHT), junc);
                }
                else if (dir == Junction.DIRECTION_LEFT) {
                    ret = new RFHumpRoute();
                    ret.JnId = junc.GetId();
                    ret.Left = Scan(junc.BeginTrackSearch(Junction.DIRECTION_BACKWARD), junc);
                }
                else if (dir == Junction.DIRECTION_RIGHT) {
                    ret = new RFHumpRoute();
                    ret.JnId = junc.GetId();
                    ret.Right = Scan(junc.BeginTrackSearch(Junction.DIRECTION_BACKWARD), junc);
                }
                else {
                    BadJunctionId = junc.GetId();
                }
                break;
            }
            if (it.GetDistance() > MaxSearchDistance)
                break;
            prev = found;
            IncOps();
        }
        DecHops();
        return ret;
    }