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         Metro station: place where the 
          subway train stops so that passengers can embark and disembark. 
          Support column: vertical support, usually cylindrical. 
          Clock: dial that indicates the time of day. 
          Escalator: set of moving, interconnected steps, that carry people 
          up and down. 
          Advertising board: sign that offers commercial products for sale. 
          Platform: deck used for the embarkation and disembarkation of 
          travelers. 
          Metro track: subway rail. 
          Subway map: plan of a transportation system. 
          Bench: type of seat. 
          Destination indicator: name of the last station of a line. 
          Footbridge: narrow passageway. 
          Lighting: electric lighting system. 
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