I'm here in Budapest and This is my sons driveway. It contains not one, but two Wartburg 353's. Indeed they are the bigger brother of the Trabant, they both are were made by IFA in the DDR. Wartburgs are a 3 cylinder, 2 cycle all steel car as opposed to the Trabbi which is a two cylinder, 2 cycle Duraplast bodied car.
The red one posted before is quite an old one , mid 70's, probably.
The white one posted here is a 76 and the green one is an 84. There are many subtle differences throughout their production.
Don, I haven't been to the Lane museum in a couple of years, but I'll never forget it. That trip was my first encounter with a Sonic drive-in too.