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Understand that the slope would take the entire L shape starting from top of the L to the bottom end of the L. A sloping bridge in both directions I believe would provide that +/- 2% slope. In the prior hijacked drawing, the track on the outer edges would be the bridges either rising or dropping (except for the left side track, after the switch, doesn't show the dash line for a bridge). It would still allow my layout to be modified when new thoughts come into my imagination.