Loading ...Yes, all the photos of the Canadian I have seen are single track. There are passing sidings along the way, of course, but it is manageable for dispatch and careful scheduling of trains and ‘meets’. The single busiest mountain pass in the US is Tehachapi pass in southern California. It connects the central valley to the Mojave desert and mainlines to LA and the BNSF mainline to the midwest. The famous ‘Tehachapi Loop’ is on this line, for gaining elevation as it winds thru the mountain pass. It was built by Southern Pacific, now owned by Union Pacific, and BNSF also has trackage rights on the line. It is single track thru many of the tunnels that could not be expanded, with many long passing sidings where there is room. The line serves over 1,000 trains per month. You can watch live train action on the line here:
https://www.youtube.com/@TehachapiLiveTrainCam/streams