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KNOW IT ALL: Thursday's Top 7 Stories at NBC News

From the latest on a deadly train derailment in Philadelphia to an attack on civilians at a Kabul hotel, see the stories we're following today.

Good morning. Here are some of the stories we’re following today:

1. Amtrak engineer doesn’t remember crash: report

Brandon Bostian, who was at the controls when Train 188 crashed in Philadelphia on Tuesday, does not remember what happened when the commuter locomotive careened off the rails, his attorney said Wednesday. Bostian was also released from the hospital and interviewed by Philadelphia police. Read more in NEWS.

2. Train tracks lacked latest rail safety technology

After more than four decades, the NTSB finally got lawmakers to approve a sophisticated automated railway safety system across the country. But with less than eight months to go before its installation deadline, the particular stretch of track where the Amtrak derailment occurred this week still has not been upgraded. Read more in NEWS.

3. Taliban claims responsibility in Kabul hotel attack

The Taliban says it was behind Thursday's hours-long siege on a Kabul guesthouse that left at least 14 people — including an American and an Italian — dead. Afghan police said that dozens of people were rescued during the attack, which began late Wednesday at the Park Palace Hotel and lasted into the early hours of Thursday morning at the guesthouse popular with foreigners. Read more in NEWS.

4. Still no sign of missing Marine chopper in Nepal

Crews searching for an American military helicopter that disappeared Tuesday while helping in Nepal following the latest quake have found no indications that it crashed. Six Marines and two Nepalese soldiers remain missing, and officials hope that they have simply been unable to communicate amid the rugged terrain. One of the Americans has been identified as Chris Norgren of Wichita, Kansas, according to his family. Read more in NEWS.

5. Senate to take another run at Obama’s fast-track deal

Senate leadership has reached an agreement that would lead to a vote early next week on giving the president "fast-track" authority to negotiate a massive 12-nation trade pact. The negotiation comes on the heels of a showdown on Tuesday in which Senate Democrats blocked consideration of legislation giving Obama so-called "fast track" authority to negotiate the Trans-Pacific Partnership trade pact without the threat of congressional filibusters or added amendments. Read more in POLITICS.

6. Deadline looms for Tom Brady to appeal suspension

The Patriots quarterback has until 5 p.m. ET Thursday to file an appeal of the four-game suspension linked to "Deflate-Gate." Football fans as well as other players have argued that the suspension — along with a $1 million fine and loss of draft picks — is particularly stiff after the Super Bowl champs used deflated balls last season. Meanwhile, Brady is facing taunting from other critics who've put up billboards calling him “#TomShady." Read more at NBC SPORTS.

7. ‘Simpsons’ actor Harry Shearer says he’s leaving show

Fans of the U.S.'s longest-running primetime sitcom may have to learn to live without Mr. Burns, Ned Flanders and Principal Skinner — or at least the actor who currently voices them. Shearer tweeted early Thursday that he plans to leave the show after 26 seasons, suggesting that his apparent departure was linked to a dispute over contract terms. Read more in POP CULTURE.

Nightly Spotlight

A father and son's grocery errand turned into a frantic rescue attempt when they saw the Amtrak train crash light up the night's sky.