Hey Andrew, that place looks familiar!
Here's a shot I took just a few seconds down the track. The second photo shows the view of the other end of that tunnel. We've travelled from where the first shot was taken, across the steel bridge, through a different tunnel, abd I'm looking back at the other end of the tunnel in the first shot.
That's a fantastic ride between Vancouver and Kamloops. This spot is just south of Ashcroft.
For those who haven't been there, there are two separate railway lines, and they follow each other for a couple of hundred km's, swapping backwards and forwards across the Thompson River.
50°40'01.84" N 121°18'35.07" W
Cheers,
Jason.