Suffice it to say, the North has long run on Protectionism, subsidies, borrowing and spending, cheap labor immigration, and Union Labor anger at "scabs" taking away their jobs for lower wages.
Same then as today, except labor Unions didn't quite exist in that period, but their precursors had the same mindsets as the later labor Unions manifested.
So what you are saying is that you have absolutely zero proof that would substantiate your claim that the Federal government subsidized Northern railroads over Southern railroads. Got it. That is what I figured would happen.