You know what your problem is, fitzy? You're a humourless literalist who takes offence at the drop of a hat.
I don't see the need for personal insults here. Such extreme rudeness isn't necessary. Perhaps you should apologize for telling such huge whoppers.
I couldn't give two shits if Burkina Faso also had a faster train 40 years ago
I don't believe that they did ... I'm not quite sure how you equate New Zealand with Burkina Faso though. You clearly stated that Canada was the ONLY country in the world. Yet you discount New Zealand? There's probably another dozen countries out there with similar stories. Heck, I wouldn't be surprised if most US services outside Boston-Washington run slower than they did back then. Certainly the two Montreal Amtrack trains don't (heck, the track on one is so poor these days, they stop it before the border!).
Canada is an advanced industrial country which had a train with a faster run time in 1971 (3h59 min to Montreal) than it does today (4h30).
3h59? Was that the best the Turbo can do? VIA has had the same time within the last decade or so with the current equipment. I'm not sure the Turbo could even sustain that. In the late 1970s and early 1980s, the best time either the morning or evening Turbo had was 4h30 ... I used to take the afternoon Turbo frequently back then. It's nothing to do with the train - it's the track, signalling, and freight that the issue.
In 1971, Canada was considered to be on the forefront of high speed rail technology, along with Japan.
That's not my recollection. The Turbo was an oddity. CN never put in the work necessary to upgrade the track and signals to allow a fast service to run. The only upgrade I recall was the bypass and new station they built in Kingston in the early-mid 1970s.
The Turbo itself was a disaster. Damn thing set itself on fire more than once. It was barely operational for the first few years, and was a joke. It must have been about 1974 before it finally was running regularly, and they withdrew them only 8 years later in 1982. The trains themselves were pretty unpleasant, without the doors separating the cars, the entire train became a smoking car. You seem to be remembering the 1970s with some pretty rose-coloured glasses.