The Northeastern District of the United Railways Trust is, at least on paper, all of the subsidiary railways north & east of Chicago, IL. In practice it’s actually all of the railways that were part of the original Parsons Vale Trust (the PV&T, LT&L, TdM, D&H, and P&W), because the CPR’s transcontinental line wraps around Lake Superior to Toronto, then west into Chicago.
The Parsons Vale Trust was far more permissive about allowing its subsidiaries to maintain themselves as separate railways than the CPKC was, so between the 5 railways (& their subsidiaries) in the district there are about 35 separate paint schemes if you exclude the one-off commemorative schemes. (And the new United Railways Trust is, not surprisingly, similarly permissive, to the dismay of the CPKC’s branding experts.)
The TdM shops are now the mechanical department HQ for the entire Trust. and the Portland shops, TdM shops, and the D&H’s Colonie shops share the work of heavy remanufacturing (manufacturing in the case of the Portland shops) of motive power and specialty cars.
The Northwestern District connects to the Western District in Toronto, Sudbury, and Chicago (it does not connect ot the Southern District at all; the CPKC only connected the CPR & KCS at Kansas City.) It does its own dispatching from the old Parsons Vale Trust operations office in Montréal, except for intradistrict routing, which is coordinated through the new intradistrict dispatching office in Minneapolis, Minnesota.