Recliner wrote

OK, that's a bit more sophisticated than I remembered. And, yes, I
agree that it's very impressive, and reliable, for mid 1960s
technology.
Mid/late 1960s car or airliner designs would feel a lot more
antiquated
compared to today's products than do those elderly 1967 stock trains.

And, unlike those trains, which remain in heavy daily use, such cars
and
planes would almost all have been retired long ago.

Some 1940-1946 airliners, eg DC-3s Dakotas C-47s remain in constant
daily use even if this is sightseeing.

--
Mike D