I have always loved watching the Train Bridge come down to let a train cross the Cape Cod Canal. And then rise again. I love the boats that have to hover on either side to wait while this happen. It’s fun to see the train cross. And the train bridge is just a treat to look at!
The bridge was constructed beginning in 1933 by the Public Works Administration for the United States Army Corps of Engineers, which operates both the bridge and the canal. The bridge has a 544-foot main span, with a 135-foot clearance when raised, uses 1,100-short-ton counterweights on each end, and opened on December 29, 1935. The bridge replaced a bascule bridge that had been built in 1910.
At the time of its completion, it was the longest vertical lift span in the world. It is now the second longest lift bridge in the United States, the longest being the Arthur Kill Vertical Lift Bridge between New Jersey and Staten Island, New York
Thanks to Wikipedia for that info.