So, it looks like the section of line Francis Barnard billed the government for building, was not actually built by him in 1875-6. I imagine the work that he was referring to was clearing a right-of-way, but that area between Cache Creek and Kamloops is in the dry belt, not much in the way of trees to clear. This first image is a snip from the Canada Sessional Papers (volumes searchable on Google books), and shows the bill for work done on the line. Note that at the bottom, that the stringing of the wire gets separate mention (it had not been done), and that this bill is dated May 1876 for work being done and partially paid for in 1875.
( Hope these pics are getting in here, not exactly sure how this thing works...this is my first attempt at a post)
Below, in May of 1875 (the last bottom few lines) Barnard indicates that the wire and poles can be placed with little additional effort.
So, it looks like Barnard never did build this line, as in this following list, about half-way down, you can see the date the line was finally built was in 1878, when the "Collins" line was totally re-built.
Now it gets interesting because the Collins line was rebuilt (at the same time as this branch line to kamloops) with threaded glass and different (shorter) pole spacing than the original 1865 line. The threaded glass used was EC&M's and the occasional fluted Cal.
Looks like I'll have to make a new post to ad some more pictures to this story...