A tunnel is an underground passageway, dug through the surrounding soil/earth/rock and enclosed except for entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube construction techniques rather than traditional tunnel boring methods.
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If you wish to discuss the contents of this page Fred's email address is at the bottom of the page. The success of Fred Wagstaff's first venture on the Internet (see 'BR Steam Footplate Memories') merits a second instalment of reminiscences from the 72 year-old retired railwayman.
Steam World 2004-2006. First Floor, 2 King Street, Peterborough, PE1 1 LT The Editors of this magazine, which does not set out to be profound, have been highly successful in capturing material both from professional locomotive engineers (who very sadly are a shrinking breed), from senior railway managers, and from people like Andrew Dow who enjoyed priviledged access to railways at an early age.