trackbed

Pronunciation: /ˈtɹækbɛd/

The English word “trackbed” has 2 meanings listed here.

noun

The layer of gravel or other foundation on which a railway track is laid.
The land on which a railway (especially one that has been closed or dismantled) was built; the roadbed for a railroad.

From track + bed (“place, or flat surface or layer, on which something else rests or is laid”).

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.