This car is in the Wiener Linien (in German) museum in Vienna. This museum is in an old carbarn which consists of five buildings. This museum is a must for all trolley fans who visit Vienna. It is near the end of the 18 and 72 lines.
I'm sure most of you are aware that these cars went to Austria as part of the Marshall Plan after WW II. In 1967 several of them were sent back to the US and donated to museums.