be advised we have multiple rescues in progress at this time. reporter: monday investigators continued examining the track, train cars in searching for video. metro north says this train did not have cameras on board. sunday s derailment along the curve wasn t far from where this freight train derailed in july. the ntsb is investigating if there s a connection between the two, but new york s governor doesn t trains negotiate the turn all day long, so it s not about the turn. something else had to happen. we want to find out what it is. reporter: this may two net rho north trains collided. damaged trach may have caused the crash. also in may, a metro north train struck and killed a track foreman. we ll be looking at precursor events, things that maybe were close calls that could have given metro north some indication this was an area they needed to pay attention to. reporter: the crash has