Fox News reports that Garzon's reckless comments were picked up from the train's black box recorder claiming that the driver knew that the train was going to derail.
He reportedly said to his bosses that he was going at 190 kmh and he was going to derail, realising the passenger train was going too fast on the curve, the report added.
According to the report, Garzon has been accused of recklessness in connection with the disaster.
The speed limit at the crash bend is 49mph, but the train was running just double the speed, the report added.
Earlier, Garzon had boasted of his 124mph speeds on Facebook and was arrested by police after the tragedy in which 80 passengers were dead and 30 critically injured.