Alternately I take the sleeper from London or Watford - to the Edinburgh or Aberdeen city centre.
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One of the greatest misnomers. I remember the lottery of sharing with a total stranger. I could not believe it. The guy who showed up was a cross between Sutcliffe and Reggie. Did not sleep much.
The other great mystery was that you set off from Glasgow Central, only to get to a side junction just abeam Carstairs, park up for about three hours, with the crash, bang of shunting carriages. Truly dreadful....has it improved any?