It runs up to just south of the Coldwater Exit, from there it branched off, one line towards Merritt, the other towards Brookmeere-Tulameen-Coalmont-Princeton. A lot of the abondoned rail bed still remains and you can travel on it between the various places. The line from Brookmeere to Princeton is (was) the most in-tact part that I have travelled. The Coq Highway took away some portions of it between Brookmeere and Hope.
Here is a video I made years ago. We rode from what was then the abandoned Carolin Mines up to Coquihalla Lakes Lodge. We travel the old KVR on portions of the ride. A lot of the ride is on the Pipeline road. You can see the old snow shed and tunnels (that were shown in the video Nito posted) as well as the 3 old tunnels at the top portion of the line, right by the Coquihalla Lakes. We also travel through one of the old train tunnels.
https://youtu.be/M-RV4WSn_4g
Some photos:
The old Railway Snowshed:
Remnants of the many tressels that were in the area from Portia up to Coq Lakes. Some images of the three tunnels at the summit.







