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full article with good graphics: https://www.propublica.org/article/train-derailment-long-trains *I remember seeing ~1 mile long coal trains on the Colorado Joint Line back in the late 70s and 80s, hauling Wyoming coal to Texas utilities, but I didn't know freight trains now can be 2 or even 3 miles long!

For anyone interested in engineering failures, the linked article may entertain. I don't think I would like to stand under any of these spans. http://www.smh.com.au/nsw/email-trail-reveals-highlevel-warnings-about-skytrain-safety-threat-20170111-gtpc6u.html In a nutshell, there are concerns over the construction methods of the elevated part of the line. The government authority in charge of roads is not allowing the builders to build over the roads until they prove it will be done safely. The builders are under pressure to avoid this delay because they will be penalised for not meeting deadlines. Competing demands?