Just saw this got put up on the DPTI site a pedestrian underpass is to be built under the Marion Station to accommodate safety regulations for electrification because the overpass does not meet them.
Construction work starts on the underpass in August and be operational at the end of October and full works complete by the end of 2013 alternative pedestrian crossing will be provided so it doesn't effect the opening date of the Noarlunga Line reopening from my understanding.
The design looks rather bizarre and anti-user to me. Running an underpass ramp off the end of the platform (i.e. not from the middle) means there is no opportunity to include stairs from the platform for those who are able to use them as a shortcut. If there were to be both a ramp and stairs, the entrances could be roughly 1/4 and 3/4 of the way along the platform instead of all users being required to go all the way to one and and then 80 metres beyond that, pointing away from the main trip generator (Westminster College) and the provided parking at that.
I wonder if the reason for the odd design is another case of central design without local knowledge, or just cost cutting? The cynic in me says that putting the ramp off the end is actually about justifying that it's not a modification to the platform and therefore no money needs to be spent bringing the platform up to DDA standards.
Still, at least it's not quite as silly as the stair-only bridge over the ARTC track built at Blackwood to the main station parking last year.