Speed of Traing, Physics

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How fast would the train be travelling when it in Lac-Mégantic derailed. There were 5 locomotives and 72 cars filled with 113,000 litres of crude oil. The elevation was 520 m Cote Saint-Luc to 406.71 m and the train travelled 11 km.

assume
locomotive weight of 200 tonne
liter of crude = 0.8 kg
Empty tanker car (79,400 kg)
I calculate 13,225,600 kg

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