Anthony sent in these tips to share:

Subroadbeds serve as support for the layout when it has to be elevated for bridge construction. The following steps must be followed for sub roadbeds to bear the weight and be stable.

1. Set the sub-roadbed height one inch below the bridge’s desired height.
2. Calculate the sub-roadbed support height by subtracting the thickness and brace width from the sub roadbed height.
3. The width of the support should be greater than the sub roadbed width.
4. Cut the supports from a plywood sheet according to the calculated dimensions.
5. Use freehand drawing to design the subroadbed and cut it.
6. Fix the support on the layout with wooden glue.
7. Fasten the sub roadbed on supports with a single nail and some glue.

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