The Department of Mineral Resources made a proposal last month that would require companies to remove certain liquids and gasses from oil train shipments, a process some say would make such transport safer.
The three-member Industrial Commission that includes Gov. Jack Dalrymple wanted more time for review and additional time for public comments.
Oil industry officials have said the state already has proper regulations in place.
Bakken crude has been linked to several fiery oil train crashes.