CNN
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When a container ship slammed into Baltimore’s Francis Scott Key Bridge on Tuesday, it led to the disastrous collapse that left six people presumed dead and took out one of the region’s key infrastructure links.

But it wasn’t the first time that kind of impact had happened: Four decades earlier, another container ship that also lost power hit the same bridge – and it stood strong.

The drastic difference in outcomes between the two accidents is an example of the dangers caused by the massive increase in shipping vessel size in the intervening decades. It’s also raising questions about whether changes…