It's all to do with atmosphere - those words conjure up images that resonate. Think about your reaction to the phrase 'Orient Express'. I bet it's an image of glamorous, well dressed men and women, 1920's and 1930's settings, luxury, extravagance, champagne and gourmet food - maybe crisp linen and fine china and possibly a detective with a notable moustache lurking in the background. All from two words.
Powerful stuff, titles .