CPRR and UPRR grading past each other

From: alan_weeks@hotmail.com

I understand that the CPRR and UPRR graders past each other by a considerable distance, but is there any record of when and where they 'met', and is there any physical evidence today showing the 'unused' grades (Google maps?)?

One can only imagine the reaction when one day graders from one RR looked into the distance and saw their opposites approaching. ...

—Alan