Shippers of both ethanol and petroleum fuel are worried that the new, slower speed standards will cause more backlogs and the potential volume requirements would also reduce overall shipping capabilities.Yesterday we reported on the rail car backlog and efforts underway to address the problem of past due rail cars for the grain sector and also noted that ethanol and crude shipments were similarly affected. In another rail regulatory matter, a new proposed rule has been released that would change the safety standards for tanker cars carrying fuel, and it could be costly. The Department of Transportation's Pipeline and Hazardous Materials Safety Administration (PHMSA) and the Federal Railroad Administration issued a notice of proposed rulemak...