LYNCHBURG, Va. — The latest in a string of fiery oil-train wrecks brought renewed demands Thursday that the Obama administration quickly tighten regulations governing the burgeoning practice of transporting highly combustible crude by rail.

With production booming in the Bakken oil field along the U.S. northern tier and in Canada, some experts say stronger rules to head off a catastrophe are long overdue. However, drafting and approving new regulations can take months or even years, an elaborate process that involves time to study potential changes and a public comment period before anything is adopted.

In the latest crash, a CSX train carrying Bakken crude from North Dakota derailed Wednesday in downtown Lynchburg, sending three tanker cars into the James River and shooting flames and black smoke into the air. No one was injured, but the wreck prompted an evacuation and worried local residents and officials.

There have been eight other significant accidents in the U.S. and Canada in the past year involving trains hauling crude, and some of them caused considerable damage and deaths, according to the National Transportation Safety Board. Bakken crude ignites more easily than other types.

The NTSB and members of Congress have been urging the Transportation Department to work swiftly on new standards that would make tanker cars more rugged.