depression in the subgrade surface

depression in the subgrade surface: Железнодорожный термин: осадка грунта, осадка железнодорожного полотна

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History of road transport — The history of road transport started with the development of tracks by humans and their beasts of burden. Early roads The first forms of road transport were horses, oxen or even humans carrying goods over tracks that often followed game trails,… … Wikipedia
Road — This article is about a route, thoroughfare or way that supports travel by a means of conveyance. For a place outside a harbor where a ship can lie at anchor, see Roadstead. For public roads, see Highway. For other routes, see thoroughfare. For… … Wikipedia

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