It dates back to government intervention in railroads pre civil war.
It's a lot of jobs, basically....the postal service loses money too and we don't shut that motherfucker down.
A government run RR has never made money, in fact it was James Jermome Hill who built the transcontinental RR with private money. Amazingly, it worked.
RRs represent the first intruision of the government into the economy, and it never stopped, to all of our detriments.
A high speed rail service among regional carriers (Boston-->NY--DC or SF--->LA type runs) would be awesome. get the government out.