On: Airbus' self-flying plane just completed taxi, tak...

[cgh]

Vancouver has SkyTrain:

"SkyTrain is the oldest and longest, fully-automated, driverless, rapid-transit system in the world."

https://www.translink.ca/Schedules-and-Maps/SkyTrain.aspx

[PinguTS → cgh]

Which is a completely closed track, much like an elevator.

[4ec0755f5522 → PinguTS]

Not sure this meets your definition but the Expo line splits: https://en.wikipedia.org/wiki/Expo_Line_(SkyTrain)#Route

[boudin → cgh]

There's a few one that existed before then. Quite crazy to think that some existed in the 70's, almost half a century ago: https://en.m.wikipedia.org/wiki/Automated_guideway_transit