pressure went to zero. as you may know, this train made nine stops prior to derailing. we need to understand how the brake system was working throughout that part of the trip. at this point, we are not aware of any problems or anomalies with the brakes. also today, we began interviewing the engineer. that interview will be continued over the next couple of days. we have interviews in process with the other three crew members. investigators from the track group have completed the assessment of the track, have conducted a detailed engineering survey of the site. earlier this afternoon, we released the track back to metro, metro north. investigators completed some of the signal testing. the rest of the signal testing will have to be accomplished tonight, late at night when the