road-bed

roadbed

[rohd-bed]
noun
1.
Railroads.
a.
the bed or foundation structure for the track of a railroad.
b.
the layer of ballast immediately beneath the ties of a railroad track.
2.
the material of which a road is composed.

Origin:
1830–40. Americanism; road + bed

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
roadbed (ˈrəʊdˌbɛd)
 
n
1.  the material used to make a road
2.  a layer of ballast that supports the sleepers of a railway track

Collins English Dictionary - Complete & Unabridged 10th Edition
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