Since different maps show different things, is the western city limits of Detroit south of the railroad tracks [[where the boundary jumps east from Telegraph for a few blocks) West Parkway Street, itself, or a line through the backyards of the properties fronting the westside of West Parkway?

Speaking of this boundary, is there any interesting story behind why Detroit Diesel would have its employee parking lot on the Detroit side of the boarder, but the manufacturing facility in Redford? Is it really just as simple as it looks [[a tax dodge)?