Question: In what city do you find a a railway halt near a Castle overlooking the Firth of Clyde?
Related documents: [0]  [DOC] Culzean Castle ( , see yogh; Scots: "Cullain" ) is a castle overlooking the Firth of Clyde, near Maybole, Carrick, on the Ayrshire coast of Scotland. It is the former home of the Marquess of Ailsa, the chief of Clan Kennedy, but is now owned by the National Trust for Scotland. The clifftop castle lies within the Culzean Castle Country Park and is opened to the public. [END] 
[1]  [DOC] Balchriston Level Crossing Halt was a railway halt near Culzean Castle, South Ayrshire, Scotland. The halt was part of the Maidens and Dunure Light Railway. [END] 
Answer: 
South Ayrshire, Scotland
South Ayrshire, Scotland