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roadbed

[rohd-bed] /ˈroʊdˌbɛd/
noun
1.
Railroads.
  1. the bed or foundation structure for the track of a railroad.
  2. 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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British Dictionary definitions for road bed

roadbed

/ˈrəʊdˌbɛd/
noun
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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