And, by the way, the origin of the phrase, "Low bridge, everybody down" is as follows:

The 360 or so bridges across the canal were basically flat so that the barges barely got under them. When passengers were carried, they often rode on the roof of the barge but had to go inside when the barge passed under one of the bridges.

Why did they ride on the roof, you ask? We can think of at least two reasons. First, it was hot inside the barge during summer months. Second, in order to make better time, two mules were used. One of them pulled the barge for about six hours and then the barge was stopped and the mule replaced with the second one. The mule that wasn't pulling the barge rode inside until the next change of mules. Would you like to share a hot barge with a mule? Neither would we.

Bev and Jerry