Spanish rail chiefs are testifying on safety before lawmakers Thursday, two weeks after 79 people died and scores were injured in a horrific derailment in northwestern Spain.

Gonzalo Ferre Molto, president of state-owned rail infrastructure company Adif, and Julio Gomez-Pomar, president of state railroad company Renfe, are expected to detail what steps are being taken to improve future rail safety.

As of Thursday, 38 people remain in the hospital, six of them - all adults - in critical condition. No nationalities were given for those still hospitalized.

The July 24 derailment near the northwestern city of Santiago de Compostela shocked the nation.