CVR Cockpit Voice Recorder aka Black Box in common language ( though this is bright orange in colour ) which records voice & video of cockpit area in an aeroplane especially . Exactly ditto the same type LVVR Locomotive Voice & Video Recorders MUST be made MANDATORY fir all locomotives & other required places that too on online basis continously streaming live footage to monitor them properly lest drunken drivers endanger precious thousands of lives , loss of property not withstanding .