Although Alex Moulton will vehemently insist the Moulton is not a folding bike, I think separate-able bikes are considered perfectly acceptable in this forum - Moultons with kingpin, Dahon Smoothhound etc.

A 2 speed moulton with no rear gear cable links to brake could make for a speedy split - see video -

http://www.youtube.com/v/c8m8BBgHNcs&hl