This evening I went to the Panama Canal. What a sight. What's amazing about the locks is that there are not any pumps, the water is gravity fed from freshwater lakes. It takes less than fifteen minutes to fill or drain one set of locks. Some of the freighters are known as panamax freighters. These freighters are built as wide as they can be to still fit in the locks. The freighter in these photos has about six inches of clearance on either side. The small rail cars on either side are used to keep the freighters centered and to pull it through the canal.