One taxi campany in Kyoto called Yasaka Group taxi has very interesing taxis.
Their normal taxi which has Three-leafed Clover lamp on top of its roof, but instead of that few taxis have Four-leafed Clover lamp.
It said there are 4 taxis in 1400 taxis they have but some say there are about 6~8.
We had one of this taxi for picking up one of our guests The one stopped at our Ryokan.
The driver of taxi told me that there are few small class taxis with Four leafed lamp, but like his one the middle class taxi is only one the campany has.
So maybe when you come stay at ours and catching taxi after the stay, you might be able to see this Taxi!! ^^