; (2) have crash and fire protections for any audio recordings that are stored only within a controlling locomotive cab or cab car operating compartment; and (3) encrypt all audio recorded by such device. (m) Review of audio recordings (1) Preservation of certain recordings For any audio recorded pursuant to this section of an accident or incident that is required to be reported to the National Transportation Safety Board, the rail carrier holding such recording shall preserve such recording according to the requirements of subsection (g). (2) Exclusive review The National Transportation Safety Board shall have the exclusive authority to— (A) decrypt, or provide a decryption key for, an audio recording described in this section; and (B) except as provided for in subsection (n), review an audio recording described in this section prior to a public disclosure of such recording. (3) Public disclosure of audio Prior to any public disclosure of an audio recorded under this section (as otherwise provided for in law), the National Transportation Safety Board shall— (A) remove all personally identifiable information in such recording; and (B) ensure that the audio recording does not contain any audio recorded earlier than 15 minutes before the accident or incident required to be reported to the Board. (n) Limited use of audio recordings by rail carriers (1) In general Upon request of a rail carrier, the National Transportation Safety Board may provide a decryption key to such carrier for any audio recording recorded by such carrier under this section, or provide a decrypted version of a recording submitted to the Board under subsection (m), if the Secretary certifies that the rail carrier and all collective bargaining units representing employees of the carrier enter into an agreement that contains the limitations specified in paragraph (2). (2) Eligible use An agreement under paragraph (1) shall require that— (A) the recording transmitted is used for training purposes only