trackbed /ˈtɹækbɛd/ noun2 •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.Just before Bloworth Crossing, you'll walk a short distance along the trackbed of the old mineral railway that connected the ironstone mines at Rosedale with the blast furnaces of Middlesbrough. — 2019 formstrackbeds