Metra Milwaukee District North trains meet at Deerfield, Ill.., on Dec. 30, 2021, on a line shared with Canadian Pacific freight traffic. Metra is seeking more information from CP on traffic impacts of its merger with Kansas City Southern. David Lassen WASHINGTON — Metra has asked federal regulators to force Canadian Pacific to hand over more documents that would help it evaluate how the proposed CP-Kansas City Southern merger may affect commuter service in the Chicago area. Metra, in a filing with the Surface Transportation Board, said CP omitted necessary documents, provided dated versions of other documents, and in other cases has shared information in computer formats that the commuter agency cannot use to judge CP's traffic and capacity analysis.