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Mules

Mules or tow trains in Panama Canal are train locomotives that help steer large ships through the canal, preventing them from hitting and damaging the canal. It was considered an important safety feature that ships be guided though the lock chambers by electric locomotives,  known as mulas (mules, named after the animals traditionally used to cross the isthmus of Panama), running on the lock walls. These mules are used for side-to-side and braking control in the locks,which are narrow relative to modern-day ships. Forward motion into and through the locks is actually provided by the ship's engines and not the mules. A ship approaching the locks first pulls up to the guide wall, which is an extension of the centre wall of the locks, where it is taken under control by the mules on the wall before proceeding into the lock. As it moves forward, additional lines are taken to mules on the other wall. With large ships, there are two mules on each side at the bow, and two each side at the stern—eight in total, allowing for precise control of the ship. Smaller vessels, such as small tour boats and private yachts, are taken as handline transits, where mooring lines to the lock walls are handled manually by line handlers on the ship. Background music: Title : Moving on. Album : x50