Sec.  42.5   Preparation and preservation of reproductions of original records.

   (a)  Each carrier may use a retention medium of its choice to preserve
   records  in  lieu  of original records, provided that they observe the
   requirements of paragraphs (b) and (c) of this section.

   (b)  A  paper  or  microfilm record need not be created to satisfy the
   requirements  of  this  part  if  the  record is initially prepared in
   machine-readable medium such as punched cards, magnetic tapes, and disks.
   Each record kept in a machine-readable medium shall be accompanied by a
   statement clearly indicating the type of data included in the record and
   certifying  that  the  information contained in it has been accurately
   duplicated. This statement shall be executed by a person duplicating the
   records. The records shall be indexed and retained in such a manner that
   they  are easily accessible, and the carrier shall have the facilities
   available to locate, identify and reproduce the records in readable form
   without loss of clarity.

   (c) Records may be retained on microfilm provided they meet the requirements
   of the Federal Business Records Act (28 U.S.C. 1732).