The deemed purchase price shall be allocated among the assets of Conrail in accordance with the temporary regulations prescribed under section
338 of title
26 (as such regulations were in effect on October 21, 1986). The Secretary shall establish specific guidelines for carrying out the preceding sentence so that the basis of each asset will be clearly ascertainable. For purposes of applying the regulations referred to in the first sentence, accounts receivable and materials and supplies shall be treated as cash equivalents.