CPKC is a "new" way to transport freight. This route affers to climb the steep mountains in British Columbia, and the Smokey Alberta! Travel through the farming Saskatchewan. The great looking Manitoba. And the hot province of Ontario! And then you're going to the states in Mexico and then you'll be done your route and you can start over again! The entire route in real life takes about 6 to 7 days.
I was going to suggest Kamloops to Vancouver, then checked the distance and that alone is over 350km! Let's face it, any Canadian route attempting part of the Transcontinental is at best going to be a snapshot.
For that route maybe a Vancouver to Abbotsford which is on the other side of Sumas, WA. Although the Devs might do the Kicking Horse Pass route as the first CPKC route. That one is from TSC
Kicking Horse Pass would be great if DTG want to introduce the CPKC to TSW. But Kicking Horse Pass as far as my knowledge from the TSC version, the route length itselft is more than 100 miles(?). Somone might correct me there.