By Mark Abrams

PHILADELPHIA (CBS) — The family of a Baltimore man who says he was aboard Amtrak 188 is frustrated they’ve been unable to find out where he is or what happened to him in the wake of last night’s derailment.

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Family members of 45-year-old Robert Gildersleeve say he boarded the Amtrak train in Baltimore for a business trip to New York.

His 13-year-old son, Marc, says his father dropped him off at lacrosse practice before heading to the train station.

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He says his grandparents on both sides, his mom, his 16-year-old sister, and other relatives are at the Downtown Marriott here waiting for some word on his dad.

“It’s very scary. We have no idea where he is, what hospital he’s at if he’s at a hospital. So we’re just trying to get as much information as he can.”

Rob Gildersleeve’s father, Rob Sr., flew up from Palm Beach, Florida today to be with the family.

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He says they’re worried and frustrated at the lack of information about Bobby. At this point, officials have refused to confirm how many still might be missing, saying they’re trying to reconcile passenger manifest lists with hospital patient records.