IPA: /ˈreɪlˌbɛd/
KK: /ˈreɪlˌbɛd/
The foundation or base that supports the tracks of a railway.
The workers repaired the railbed to ensure a smooth ride for the trains.
Railbed → It is formed from "rail" (from Old French *raille*, meaning a bar or beam) and "bed" (from Old English *bedd*, meaning a place to lie down). The word "railbed" refers to the structure or foundation on which railway tracks are laid, resembling a bed for the rails.
Think of a 'bar' or 'beam' ('rail') resting on a 'place to lie down' ('bed') — that's why a railbed is the foundation for railway tracks.