Passenger Train Collector got me thinking in his thread about "who only runs 100% passenger trains?" While few apparently do it occurred to me that if I were able to run only one train it would indeed be the SP Daylight Special. There is no more beautiful train that was ever run.
If I had to run one train that would be the one.
In freight trains I would choose a Chessie System double-header with two SD40-2's and a string of assorted '40 foot boxcars.