The crash of a popular funicular railway car in Lisbon will go down as one of the worst public transit accidents in Portugal's history. Sixteen people were killed and 21 injured, including a Canadian.

The railway cars operate on steep streets in the middle of the city and are extremely popular with locals and tourists. Here are the facts about these transit lines and the incident being investigated.

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How did this happen?

The cause isn't known yet. There has been speculation that a cable snapped or the brakes were faulty, but the investigation is in its early stages and nothing has been determined.

The railway is called Ascensor da Gloria, or the Gloria Lift, named after the street, Calcada da Gl

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