Barcarole (or barcarolle as you wish) is a Venetian boat song usually in 6/8 or 12/8 which allows the composer to make that alteration of strong and weak beat sugesting a rowing rhythm. In this case, it used to imitate the sound of a moving train in which the main character meets the young girl. Of course, Venice - the home town of Barcarole, simbolize the feeling of the man who had been kissed on the train. And still "the grass will all grow back again". In my opinion - the best of the 2 albums, and one of his finest.