Thanks for the news post. It is a very depressing event to read about such mishaps.
As I pointed out before, rails 'can' fail even if they are manufactured with the best quality! As Sanjay sir explained clearly, there are so many factors that affect the rail's performance other than manufacturing quality. Let's wait for more data before making conclusions. The rail failure in this case could have happened due to old rail being used, or improper bolting of rails and many other more likely reasons.
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And let me make it clear about what I am pointing out. I am NOT saying that rail failures don't happen in IR. I am NOT saying that rail failures never lead to accidents on IR. All I am saying is that the reason for rail failures is NOT the manufacturing quality. Your original post indicated that the rail fractures and failures are due to an engineering problem right in the factory level. I am saying that the problem doesn't lie with the manufacturing plants or the factories but lies with maintenance and construction standards. Any engineering component, no matter how perfectly it is fabricated, can fail occasionally. But good designs will have a low rate of failure .The manufacturing quality of the rails is the ONLY thing I am arguing about. Not anything else.