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The behaviour of complex networks under failure or attack depends strongly onthe specific scenario. Of special interest are scale-free networks, which areusually seen as robust under random failure but appear to be especiallyvulnerable to targeted attacks. In a recent study of public transport networksof 14 major cities of the world we have shown that these systems whenrepresented by appropriate graphs may exhibit scale-free behaviour. In thispaper we briefly review some of the recent results about the effects thatdefunct or removed nodes have on the properties of public transport networks.Simulating different directed attack strategies, we derive vulnerabilitycriteria that result in minimal strategies with high impact on these systems.

Public Transport Networks under Random Failure and Directed Attack