file this under "there is a prototype for everything" or a Rule 34 if you will.
the Super C was a commerical failure - the added $1400 (in the 1960's!) was just too much to be a viable long term offering. sure they ran trains with as few as one car, but on average, it was 15-20 cars. it's a hot shot service with exactly a single daily train, the rest of the traffic was "normal" sized. modeling a drag freight on a bridge line with 4 cars... that's not gonna look "right" to many.
From what I have seen, that Super C approach is basically what today is know as PSR (Precision Scheduled Railroading) except it's done with just about everything, just not one train. At least the way CSX has put it into play you can now basically see two trains combined with the 2nd train's locomotives running as DPUs when they are scheduled to leave at the same time and can make the line/grade.
I don't model operations. But for those who model operations in a modern environment, are you modeling PSR? By my last count, CSX, UP and NS are all running PSR.
Bob
Bob