David Schaper

Updated at 11:59 p.m. ET

Federal investigators say a track switch locked in the wrong position appears to have led to Sunday's deadly Amtrak collision with an idle CSX freight train, and they are hesitant to say this latest wreck — the fourth fatal Amtrak incident in seven weeks — is part of a broader problem with what some have called a "lax safety culture" at Amtrak.

Updated on Dec. 4 at 6:29 p.m. ET

Some of the nation's 3.5 million truck drivers staged protests with their big rigs at truck stops and a few state capitols around the country on Monday, in hopes of derailing a new safety regulation that is set to take effect later this month.

As fire fighters in California's wine country worked frantically to contain and put out devastating wildfires that killed at least 42 people in recent weeks, and while his officers were still evacuating residents and searching through the burned ruins of homes for missing persons, Sonoma County Sheriff Rob Giordano had another problem to address.

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MARY LOUISE KELLY, HOST:

As some residents of South Texas begin to dry out their homes and belongings, significant challenges lie ahead as the city of Houston and others in the affected area look to recover and rebuild.

Congress is fast-tracking billions of dollars in recovery funding. But just because that down payment on Harvey recovery is on the way, that doesn't mean the rebuilding of Houston and other areas hammered by the storm's high winds and historic rains will go quickly or smoothly.

Here are five challenges ahead for the Harvey recovery:

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