Courtesy of Old Salt Blog, here's a time-lapse video of a passage through the Panama Canal. The trip lasts 11 hours, but the video takes less than 7 minutes - much more palatable in our high-speed world! Note the "locomotives" on either side of the ship, hauling it through the locks. They're partly visible from time to time, as in the video 'cover image' below, on the right of the ship's bow.
The digging of the Panama Canal remains one of the great adventure stories of the late 19th and early 20th centuries. It advanced not only navigation, but also medicine, engineering and a host of other disciplines. If you haven't already read about it, I recommend David McCullough's book 'The Path Between the Seas'.
It's a remarkable tale, very well told.