Nostalgia & History > CNW Question

Years ago I purchased a copy of what is a set of Grade Profile Charts for the CNW Western Operating Region. The cover page on these pages has, "Engineering Department" Seniority Districts B2-T2 and is dated March 01, 1990. They are Grade Profiles/Track Charts/Rail Info. My question is, why are these labeled as Seniority Districts? I would think, the way the are titled, that they would be more along the line of actual Seniority Lists, as in, Crew Dates etc. Why this way on the title? Was it easier for the CNW to do these as such? Just curious on the title.  Thanks for any replies.  Ben 

You might want to address your question to the C&NW Historical Society. There is probably someone there who can find out the answer. 

Bob Perkins