NIMBYs, environmentalists and just about everyone else would object to a high viaduct there!dbl96 wrote: ↑Thu Feb 01, 2024 2:08 pmBridgewater is at approximately 400m above sea level, and Hahndorf is at approximately 350m. The proposed alignment is at a minimum 5000m between the two stations, so at a constant gradient, the slope would only be 1%, which is completely workable.
Of course, this requires that the gradient is constant - which is only possible with a tunnel under Bridgewater East and a substantial viaduct to bring the railway over the Ongkaparinga Valley.
I'm curious about the gradient of your proposed route from Mitcham to Aldgate, too. Presumably you propose a long tunnel under Crafers and Stirling from somewhere in Brownhill Creek?