I only ever used 'blind siding' to refer to one that didn't have a switch to the main at each end. It is interesting to learn that there are other meanings.
I don't see a contradiction in the definition. The first part of the definition refers to an agent or representative particularly assigned to that track (probably of course together with others). The second part refers to an agent like a 'district manager', with responsibility for a wider territory including functions too small to justify a full-time or direct-report representative or 'delegate'.
