Vulnerability Analysis of Urban Rail Transit Network considering Cascading Failure Evolution

Table 2

Vulnerability index range.

Vulnerability level	Vulnerability index range	Meaning
Extremely high level	[0.3, 1]	Station too prone to failure
High level	[0.25, 0.3]	Stations with a high probability of failure
Medium level	[0.15, 0.25]	Stations with a medium probability of failure
Low level	[0.1, 0.15]	Stations with a low probability of failure
Extremely low level	[0, 0.1]	Stations in robust state