A carrier of passengers owes a duty to exercise care in relation to dangers likely to arise from the ordinary use of the carriage, not from extraordinary, reckless or tortious use by passengers. A 15-year-old who deliberately squeezes through a train window to spray graffiti is not owed a duty to be protected from the consequences of that conduct, even where the window could have been modified to prevent passage. The question whether Modbury Triangle principles apply to a plaintiff's own criminal conduct (as distinct from third-party criminal conduct) was expressly left open.
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