When I went to High School in NYC in the 1960’s, the old Metropolitan Avenue El had rolling stock from the 1890’s in service. It was the oldest rolling stock in the Western Hemisphere, even the Cubans had newer trains.
They were sparse, but except for the occasional engine fire in mid-August, they ran pretty well.
I have no trouble believing that, 70 years for a rail car is not unheard of.
Pittsburgh Only relatively recently (last decade or so)
finally retired some of its old trolley cars, because the price of refurbing them finally got too high. But they were easily dated to the 40s and 50s is not older.
The legendary MTA “Q” cars. Started out as open platform Brooklyn Elevated Railway cars. Technology that predated flight but was the working definition of “bulletproof”.