May 3 (Reuters) - Pressure restrictions on TransCanada Corp's Keystone oil pipeline was lifted on May 1 in a letter issued by U.S. pipeline safety regulators, a spokesman for the agency told Reuters on Thursday.
It was not immediately clear what current rates are, said Darius Kirkwood, a spokesman for U.S. Pipeline and Hazardous Materials Safety Administration (PHMSA).
The company had shut down its 590,000 barrel-per-day Keystone pipeline, which links Alberta's oil sands to U.S. refineries, in November after a spill in South Dakota. (Reporting by Devika Krishna Kumar in New York; Editing by Lisa Shumaker)