"We are extracting the data and will be providing a characterization of the data within the next few days," NTSB spokesman Chris O'Neil said Wednesday.
Extracting data from recorders in train crash may take days →
"You hear all the machinery in the background. They are working around the clock, in 12-hour shifts, to remove the debris as quickly and safely as possible," he added.
Official: Recovering train data recorder could take days →