On the Norwegian Encore, the   Panama Canal Transit   was a highlight.  Yesterday, Sunday, the Middle Rhine Transit could well be the top scenic portion of this river cruise.  Steve, our cruise director, provided commentary throughout the four-hour journey, which included numerous drinks and an English Teatime treat. The transit in photos.  But first, Saturday from Cologne to Koblenz.  A Japanese whiskey, Hinotori for pre-dinner.   We had two classical music entertainers playing popular songs on the region after dinner. The next day, for the Middle Rhine Transit, we thought we'd have lunch in Aquavit, because it offered a better view of the experience, and we could just sit there through the whole interval. The two wines were German. With appetizer.  Artichokes and cheese. Pumpkin soup. Lunch of salad and rigatoni bolognese. The Middle Rhine River Transit begins.  After a while, these cities all seem to look about the same.  There w...