MiniCal Sheet. MC-4049;Conrail SD50 Diesel #6707 (1991+). MC-4066;Conrail Executive E-Unit Diesel or Passenger Car (1980-1992). MC-4223;Conrail Operation Lifesaver Locomotives, 1997+. MC-4271;Conrail Numbers for SD70MAC & SD80MAC (use with 87-994 or 87-1051).