The most tragic train accident in history occurred on December 26, 2004, in Sri Lanka, known as the "Queen of the Sea" train disaster. Unlike most rail accidents caused by mechanical failure, this was caused by the Indian Ocean Tsunami. The train was traveling from Colombo to Galle when it was struck by massive waves near the village of Telwatta. The water surged into the carriages and overturned the train, trapping passengers inside. It is estimated that over 1,700 people lost their lives. Another historically devastating accident (and the deadliest caused by operational failure) was the Saint-Michel-de-Maurienne derailment in France in 1917, where a troop train carrying soldiers home for Christmas suffered brake failure on a steep descent, killing an estimated 700 to 800 people. These events remain somber reminders of the immense scale of maritime and terrestrial disasters.