See here.
Reminded me of the same situation in Cuba. The so called vintage cars in Havana were nothing but a shell and equally dangerous.
I have spent the last 2 weeks in Prague and though not in the centre much did see these cars around and they look terrible, I think the photos in that article are quite old as many of the cars look nothing like that.years ago there were some nice traditional cars that were used for these tours and were proper vintage cars but alas no more.