Introducing system interdependency into infrastructure appraisal: from projects to portfolios to pathways

Infrastructure Complexity

Table 6 Pathway impacts for the five rail infrastructure alternatives ^j

	Environmental impact (£bn)			Social impact (£bn)
	Pathway minimum	Pathway maximum	Range	Pathway minimum	Pathway maximum	Range
High Speed Rail	−4.31	−2.23	2.08	−3.20	0.29	3.49
High Speed Rail with Option to Expand	−4.31	−2.23	2.08	−3.20	0.29	3.49
Commuter Rail	−2.93	−2.19	0.74	−0.61	0.29	0.90
Commuter Rail with Option to Expand	−3.06	−2.19	0.87	−0.61	0.29	0.90
Full Rail	−3.06	−2.30	0.76	−0.61	0.29	0.90
	Financial impact (£bn)			Service impact (£bn)
	Pathway minimum	Pathway maximum	Range	Pathway minimum	Pathway maximum	Range
High Speed Rail	−14.48	13.18	27.66	−40.13	0.90	41.03
High Speed Rail with Option to Expand	−20.39	11.38	31.77	−40.13	0.90	41.03
Commuter Rail	−16.26	13.63	29.89	−2.43	0.90	3.33
Commuter Rail with Option to Expand	−20.39	13.33	33.72	−2.43	0.90	3.33
Full Rail	−18.26	11.94	30.20	−2.43	0.90	3.33