john-ston wrote:A track underneath Quay Street would solve that problem. In saying that, there would be no problems with freight trains running through Auckland.
Are you planning on using electric trains or diesel to run these services through the tunnel. The former would require wires to Whangarei while the latter would mean the tunnel would need ventilation of some sort. You would also have the problem of a freight train taking up a couple of slots in the tunnel to Britomart which would hold up passenger services. Also its bad enough that we have an underground station for diesel trains let alone run freight trains through it, just imagine locals and visitors waiting for their train hearing "passengers on platform 5 please stand back from the tracks as the next train passing through is a freight train".
john-ston wrote:Generally, firms are more likely to choose the quicker option - that is why rail in general does not have a high amount of traffic as opposed to trucking. Improving the existing North Auckland Line is going to do little to attract any additional freight; that is unless you are able to slash the journey time.
In business you need to weigh up the benefits of all options. If it is doesn't matter if your freight is at its destination an hour or two later than you will pick the cheapest option.
If the freight isn't currently going by rail then there are two reasons for that. 1. It can't because it is either time sensitive or can't get through some of the tunnels. 2. Kiwirail haven't done a good job of selling their services.