The derailment happened in a remote part of Missouri. More than 200 passengers were onboard, including two troops of Boy Scouts.
"There are approximately 243 passengers onboard with early reports of injuries," Amtrak said in a statement sent to Newsweek.
A preliminary report about an October 12 train derailment in Washington, D.C., attributed the incident to a flaw "not easily identifiable" in visual checks.
"We are intentionally not setting deadlines so that safety and good data drive our decisions," WMATA General Manager Paul J. Wiedefeld said on Monday.
The trains' wheels were positioned too wide on the axles, which could cause a train to slip off the tracks.
The LIRR urged customers to find alternate routes after service was suspended on the Ronkonkoma and Huntington/Port Jefferson branches.
All 280 people living in the small town of Bartow forced to leave homes following chemical leak.
The worst injury is a broken leg, New York Governor Andrew Cuomo said.
The train derailed shortly after midnight on Monday.
The lawsuit, filed in Philadelphia, cited "serious and disabling" injuries from the May 12 derailment that killed eight people and injured more than 200 others.
Positive train control (PTC) automatically slows or even halts trains that are moving too fast or heading into a danger zone.