I might differ with the term; "most reliable" ...........I would shoot for
"Longevity" or "Staying power" maybe, but reliable???????  Not so much. They
are for the most part they are twenty or more years old.

Skipper

15 Most Reliable Vehicles in History

https://ca.finance.yahoo.com/photos/15-most-reliable-cars-in-history-slideshow/the-3-million-mile-volvo-photo-1417810223750.html