Redundancy in the London Tube Network

This is an analysis of the redundancy in the London Tube Network. The most influential stations if disrupted are King's Cross St. Pancrass, Baker St, Bank and Oxford Circus. Because the classic measures of betweenness and closeness centrality do not consider how easy it is to circumvent a node in case of disruption, a new measure is defined that compares the cummulative closeness centrality of the enitre network to that of a subgraph excluding the node in question.
Minimum Spanning Tree
Degree Distribution
Closeness Centrality
Betweenness Centrality
Global Closeness Difference Centrality