Keil Canal and St Petersburgh Bridges

While passing through the Keil Canal we passed under this rail bridge which was really impressive, there was a running commentary from the Bridge (on the boat) with various facts about the sights we were passing. The bit I can remember about this rail bridge  was the fact that to get the correct height above the canal and and the need for a gradual gradient, this start of the gradient was four miles away. 

 St Petersburgh is a city built around several islands, with canals, bridges , and even more water and bridges wherever you turn.  This was jusr a snap shot from the coach as we passed through the city,