TransCanada Corp will curtail shipments on its 590,000-barrel-per-day Keystone crude pipeline by 35 percent for the remainder of April, according to a shipper notice dated Wednesday. The move comes after TransCanada told customers that the earliest restart date for the pipeline, which was shut over the weekend, is early next week, a company spokesman said in an e-mail. The pipeline delivers crude from Hardisty, Alberta, to Cushing, Oklahoma, and to Illinois. (Reporting By Catherine Ngai; Editing by Meredith Mazzilli)