Shuz wrote:Aidan, a rail corridor adjacent the Southern Expressway is unviable because of the gradient, just as a rail corridor via the South Eastern freeway is unviable due to the gradient.
Why people are making these ridicolous conceptions that because a freeway is there, a railway line should be there also? It appears that there is a subconcious fantasy in ones mind that wants to derive Perth's PT success and implement it here - which is like comparing apples to oranges. We have a completely different layout, different lifestyle, different commuter needs, etc.
Fabricators idea is very well supported because it utilises an existing rail corridor,
and is heavily backed by years of planning studies into the extension of the Tonsley line. The only speculative part is connecting the two.
bs wrote:A railway build alongside the Southern Expressway would have to contend with grades in the order of 7 - 8%. Those grades are much higher than the maximum allowable for a railway.
Also the success of Perth's railway had more to do with high average speed obtained due to the generous spacing of stations in addition to the availability of frequent bus transfers and large car parks than the fact it runs down the middle of a freeway.
Aidan wrote:Allowable by who? Although it's very steep for a railway, it's still technically feasible.
fabricator wrote:8% is 1:12.5, which no conventional train could climb.
http://en.wikipedia.org/wiki/Saluda_Grade steepest grade standard-gauge mainline railway grade in the United States, highest official grade of 4.7% but reaching 5.1% at one point.
My contact in Parliament was told by transport department engineers it isn't possible to climb that hill. I think that proves they haven't considered modern engineering methods, like tunnelling machines or subways. The extension will be electric from day one, so exhaust fumes aren't an issue.
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