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Not counting some funicular cars, the oldest rail vehicle in regular service in Switzerland is the lone rail car on the short Rheineck to Walzenhausen rack railway. This small rail car dates from 1958, when this line was converted from funicular+tram to a single rack railway line.
Since this line is theoretically below the threshhold of economic viability (revenue covers less than 30% of operating costs) it was considered closing it altogether, but due to the line being important and iconic to the town of Walzenhausen they made an exception and decided to keep it. It is planned to replace the aging rail car with a new driverless railcar to save on costs. This is expected to happen around 2025-26.
The car is not air conditioned, but thanks to high platforms it is wheelchair accessible.
