Not too much out there in the english language, but the pics speak for themselves: basically the practice of disassembling a frame pretty quickly and temporarily to pack onto a bus, train, airliner etc. It seems to have been pretty common in JP for decades as a way of getting to rides via rail.

All this of course makes it bizarre, almost spooky, that I've never seen anything about it on /n/. So, dumping some pics I've found.