Off the rails: What’s going on with all these deadly train crashes?

In a literal sense, railway safety seems to be off track across the country, as three fatal train accidents have captured the media spotlight in as many months.

First, in December, there was an Amtrak train that derailed in Washington State as it took a corner at more than twice the speed limit, killing three people and injuring nearly 100 others. Then, in late January, an Amtrak passenger train carrying Republican members of the U.S. Congress slammed into a garbage truck in Virginia, killing one person on the truck. And earlier this month, an Amtrak train crashed into a parked freight train in South Carolina, killing two crewmembers and injuring at least 116 others...