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[–] • 0 pt

How can these possibly cost $2mil/ mile? Rail costs around $1mil/ mile

[–] • 1 pt

The land for the walls is usually already part of the existing right of way.

New rail needs the land.

[–] • 0 pt

Concrete is more expensive and more in demand.

[–] • 0 pt

Sure, but you don’t need to extensively level ground for the walls.

[–] • 0 pt

You might. Depends on where the highway is.