Railway station is -- where trains regularly stop to board or de-board passengers and/or freight. It generally consists of a platform next to the track and a station building which provide related services such as ticket sales and waiting rooms etc
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Railway yard is -- where there are series of tracks for storing, sorting, or loading/unloading, railroad cars / locomotives. Rail yards have many tracks in parallel for keeping rolling stock stored off the mainline, so that they do not obstruct the flow of traffic.