The interchange is designed to place each of the OASDHI trust funds in the same position as it would have been if railroad employment had been covered under Social Security since its inception.
The OASDHI funds are placed the same as if Social security had covered railroad employment.
Since the rich are a tiny proportion of taxpayers, the only thing this could mean in practice would be an improvement relative to the position of the poor--an extraordinary idea for supposedly left-of-center leaders, however modern or forward-looking, to adopt.