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>> brake pressure -- >> and the time of that again, please. >> the brake pressure went to zero five seconds prior to the stop -- to the complete stop of the locomotive. the brakes are held off by pressure so at 120 psi, the brakes are held off. when the pressure diminishes, particularly when it goes to zero, full braking application happens. >> you think the application occurred before the train derailed or after the train derailed? >> don't know that at this point. >> the mechanics of this, can you explain to us how it works, the engine's at the back and the engineer might be i guess at the f...

>> the brake pressure went to zero five seconds prior to the stop -- to the complete stop of the locomotive. the brakes are held off by pressure. so at 120psi, the brakes are held off. when the pressure diminishes, particularly when it goes to zero, full braking application happens. >> occurred before the train derailed or after? >> don't know that at this point. >> the mechanics of this, can you explain how it works? was the engine at the back and the engineer might be at the front of the train? how does the operate the train. >> last question. how does he operate the train in a pusher config...

>> the brake pressure went to zero five seconds prior to the stop -- to the complete stop of the locomotive. the brakes are held off by pressure. so at 120 psi, the brakes are held off. when the pressure diminishes, particularly when it goes to zero, full braking application happens. >> do you think the application occurred before the train derailed or after the train derailed? >> don't know that at this point. >> so from the mechanics of this, could you explain to us how it works with the engines at the back and the engineer might be at a -- i guess at the front of the train? how does he oper...