Since Mercedes did not mass-produce an S-Class wagon, the German coachbuilder Binz, often in collaboration with Cadform, created these one-off prototypes or very limited production vehicles.
Just found this story of the blue S500T from FB:
1994 Mercedes W140 S500 T
An Austrian businessman wanted to convert his S-Klasse into a wagon. He commissioned CADFORM (former Mercedes-Benz partner for the conception of prototypes and interior components), who developed the concept which was eventually built by Binz (Daimler’s in-house supplier for special bodies since 1939). Mercedes was so happy with the result, they approved a limited series of 100 wagons. 20 000 brouchures were printed and sent orldwide but for some reason production never took place.
Binz S500T are rare station wagon (estate) conversions of the Mercedes-Benz S-Class, primarily based on the W140 and W220 generations. Not many infos available about these models

