Sentence:  The last stop on the West Coast Main Line before you cross the border into Scotland, the strategically placed Carlisle Citadel is a station steeped in history. Opened on September 1 1847, the <WSD>cavernous</WSD> station was once home to seven railway companies in the pre-Grouping years. 
Meaning of the word marked with <WSD> tags:  Resembling a cavern; vast