Just from a drivers perspective here, I think the underpass idea is fantastic. Anyway to completely eliminate the ability for pedestrians to interface with the railway is good. I don't know if it is a slight amount of utopia, or what, but the electronically controlled gates that they have at Oaklands (and all around the network) are fantastic in theory, but infact have one giant flaw that school students particularly exploit!
That is the fact that it has an 'Emergency Exit" which can be very easily opened, and it circumvents the entire safety procedure, meaning that they can run out infront of a train (because children inherently will take more risks) to catch it, and risk their lives for the sake of getting it.
It concerns me that the community appears to have totally missed this point, and is willing to expose school students at Wesminster (and a lesser part Marion Primary) to risk because of a concern that an underpass (regardless of being wide open) is a giant risk for their community.
But hey, thats just my opinion, but take heed, those controlled pedestrian gates aren't a silver bullet solution, and create their own problems but the ability to circumvent the entire working of them.