the east side of the bridge appears to have ended up much further from its abutment than the west side. for reference, the 2018 twitter photo was of the west side, but you can the same similar cable remediation on the east side as well in the streetview from the trail below bridge, taken in...
How are the reduced posted weight limits determined in these scenarios? Is 26 tons chosen through detailed structural analyses assuming certain failed members or is it a judgement call based on the types of vehicles that they want to prohibit?
Dik - I'd wager every major city in a snowy climate has at least 1 similar situation. when i lived in pittsburgh, there was an old (80 years old) concrete bridge i remember that had such bad spalling problems they ended up building a deck over the road below to catch the falling debris. they...
NTSB Vice Chairman says train derailed before reaching the switch, as suspected.
https://billingsgazette.com/news/local/details-emerge-from-montana-train-derailment-that-left-3-dead-dozens-injured/article_11cd6bfe-a5dc-51eb-963a-6510af81f72f.html
"The derailment occurred on a gradual right...
spsalso - i think this will be entirely dependent on what track work occurred in the days leading up to this event. the neutral rail temp in montana is probably 95, which would mean heat restrictions should start at 85 deg ambient temperature so definitely in range of problematic temperatures...
based on the photos from that foxnews link this looks likely to be track caused due to a sun kink, or track buckle. The first few cars will usually make it over the buckle, often deforming it more as they pass, and the cars behind derail and get dragged along for as long as they decide to hold...
