Sub roadbed

I am modelling in HO. What should the width of the sub roadbed be.

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There isn't a standard-width sub-roadbed or roadbed. That depends upon your particular prototype's practice at the date you model and the location you are modelling. Sub-roadbed design depends on the terrain/surface, the weight to be carried and the particular materials available for construction.

If there is an NMRA standard, it will be a generalized dimension based on all the above factors.

Regards, Greg.P.

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Gregory Procter

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