In the course of going through train related items I haven't looked at in 10+ years, I found this booklet which I probably purchased at some long since forgotten train show:
To avoid fully opening this extremely thin booklet and possibly damaging its binding, I was able to glimpse the last inside page and it's signed for the ATSF by a General Manager, and signed for "Locomotive Engineers" by a Chairman and a Secretary.
Is this an early version of what would become, in later years, a union contract?