Why are professional services *alone* for Chicago's elevated Red Line extension—in a low-density area—now costing $1.24 billion for 5.4 mi ($230 million/mi).

Toulouse Metro C, under construction mostly underground in a dense urban environment, is €3.45 billion TOTAL for 16.7 mi (€207 million/mi).
Reposted from Alex
High level summary on Red Line Extension cost growth here is:

- Hard costs come out mostly flat

- Professional Services (Engineering, Construction, Project Management) increased over 4x

- 15% contingency added in

- Financing Costs added in

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