Before revision: The record is based on average speed rather than passage time because ships follow different routes.
After revision: ard, Isambard Brunel and the Great Atlantic Steamships |location = New York |publisher = HarperCollins |year = 2003 |isbn = 0-06-019595-9 |url-access = registration |url = URLThe record is based on average speed rather than passage time because ships follow different routes.