The crash Sunday killed four people and injured more than 60 others.
Earl Weener said Monday at the crash site that the recorder was found in the train's front car and has been sent to Washington for analysis.
The other event recorder was found earlier in the rear locomotive.
Weener said investigators hope to download information from the memory cards from that recorder on Monday. They hope it can provide information on the speed of the train, how the brakes were applied and the throttle.
He says they've already had some success in retrieving data. But the information has to be validated before it's made public.