track ballast (Q599697)
trackbed upon which railroad ties are laid
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other details
aliases gun platform
 ballast
description trackbed upon which railroad ties are laid

External Links
(P227) 4389271-1
(P244) sh85011269
(P646) /m/05cvq2
(P1296) 0082810
(P1417) technology/ballast-railway
(P2581) 00805266n
(P2924) 1847717
(P8189) 987007282438705171
(P8814) 04103827-n
(P11514) ballast-2f8d0e
(P12385) balast-0