HyperDic: railroad_bed

English > 1 sense of the expression *railroad bed*:
NOUN	artifact	railroad bed	a bed on which railroad track is laid

English > *railroad bed*: 1 sense > noun 1, artifact
Meaning	A bed on which railroad track is laid.
Part of	line, railway line, rail line	The road consisting of railroad track and roadbed
Broader	bed	A foundation of earth or rock supporting a road or railroad track