the 200's have them as well well some did for Yamagata Shinkansen Tsubasa and Akita Shinkansen Komachi Mini-shinkansen sets.
Only the K sub-sets had (have for the remaining 10) those retractable nose couplers, and only on one car (Type 222, Morioka side), the earlier E ,F and H formations didn't have them, and neither did the G formations (though, as they consisted mainly of cars from E formations, thats no suprise). In fact none of the 200-0/1000/1500/2000 sub-types where build with anything other then the emergency coupler as seen in the clip. The K formations only got them for (as you already pointed at) combined services with the then new 400系, which was the entire reason behind forming the K sets in 1990~1992 in the first place.
the 0 series never from what i know used it as a set.
Only JR east has ever (and still does) ran coupled Shinkansen sets in regular service. The 0系 nose coupler was never intended for regular service, it's for emergencies like some members already hinted at, it seems far too cumbersome a process to extend the coupler to ever be used this way in service, on top of that it only seems to be a mechanical coupler with Air hoses, no electrical conection as far as I can see.
At the time the 0系 where build the shortest 0系 formations where 12 cars, only after the breakup of JNR where shorter 6 and 4 car formations formed (with the exeption of set R0 which was still formed in 1986, at the end of the 0系2000番台 production (R0 was a full 0系0番台 formation though)). As the Tokaido/Sanyo Shinkansen stations where build for max 16 car formations, coupled sets where never an option, nor practical considering the linear operations of the Tokaido/Sanyo Shinkansen (straight line, no branches) as oposed to the eastern Shinkansen.
Sander
