There look to be locos mid train. Is this right ?The derailment is being reported by several news sources as the consequence of a collision between freight trains. For example http://www.abc.net.au/news/2015-03-31/freight-train-blocks-adelaide-crossing-collision/6361000?section=sa
The overland would be around Murtoa so maybe the line will clear prior to its arrival into Adelaide.The number of trains stacked up behind the crash site in each direction might still be an issue on a line with such a low capacity.
Photos show wagons with QRN and Aurizon logos on the reflective strips and one wagon was QQGY548M. This confirms that the train rear ended was definitely 2MP1
Edit saw another pic showing QQGY wagon number.