[Code of Federal Regulations] [Title 49, Volume 8] [Revised as of October 1, 2004] From the U.S. Government Printing Office via GPO Access [CITE: 49CFR1242.04] [Page 172] TITLE 49--TRANSPORTATION CHAPTER X--SURFACE TRANSPORTATION BOARD, DEPARTMENT OF TRANSPORTATION (Continued) PART 1242_SEPARATION OF COMMON OPERATING EXPENSES BETWEEN FREIGHT SERVICE AND PASSENGER SERVICE FOR RAILROADS\1\ --Table of Contents Sec. 1242.04 Special tests. When the separation of common expense accounts between freight and passenger services is based upon special tests or service unit factors, such tests shall be made at sufficiently frequent intervals to represent actual operating conditions. The service unit factors used are those of the reporting period.