![A security guard attempts to stop photographs of the buckled span on the Skytrain viaduct in Sydney's north-west.](/web/20170116065410im_/http://www.smh.com.au/content/dam/images/g/s/6/s/6/9/image.related.landscape.460x307.gtpc6u.png/1484502349181.jpg)
Secret emails reveal Skytrain project 'safety' threat
The state's roads agency became so concerned about the safety threat of an elevated section of Sydney's $20 billion new rail line that its top officers pushed to halt construction on the project.