Very Valid pointsFrom Mercer DrTwo of the golden rules of modern railway design are straight platforms and min 200m radius curves, both of which can be ignored/exceeded, but there are consequences.
- Follow Airport drive in median on viaduct
- Straight over the top of Value Car Park
- Just prior to Airport drive, slight curve to right to go over corner for Merc service centre to aim for Macca's in distance.
- Holiday Inn kept to left
- Left turn to go in between carpark and Qantas Terminal over the top of the surface carpark.
- All on viaduct like Brisbane
- Direct air bridge access to International and Qantas,
- Bit further to Virgin using the existing airbridges
- T4 access via Virgin
Terminus station, no hope of extension. Agree if you want extension you need to go UG, not sure the trhough trains need to access the actual airport station though as airport users from north would be very low.
The awful Rushall curve is something in the order of 130m radius and the problematic Sydney Olympic Park curves are around 150m.
Assuming airport trains are the same length as 6 car suburbans, approx 180m of straight track is needed for the platform(s) which is just doable assuming the station is between the Park Royal and T2. Avoiding the Nth corner of the Park Royal and the high part of Melbourne Drive, and squeeze in a reasonable curve would be quite clever.
If only provision had been reserved for rail access...
The proposal I suggested was a straight section for the station and assumed cross overs to fit is at least 300m long. On a compass heading looking along the station would be around 45 degrees west of north. ie SW to NW alignment. Curves should also be ok.