It could depend a lot on whether the Perth alignment is through sand and Melbourne through rock.

Regards,

> On 6 Jun 2018, at 08:00, Prescott lenkaprescott@...> wrote:

>

> A pertinent comment on a news item:

>

> "Why is it so expensive ? Perth is building a 8.5 km underground rail line to the airport for $1.86 billion, or $220 m per kilometer including 3 stations. For Melbourne Airport rail line a 15 km line with a 9 km underground section is being touted at $10 billion, or $670 m per kilometer."

>

> WA can build railways, even underground ones, cheaper than NSW can build tramways!

>

> Tony P

>

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