1938TS UNDMs; What were they like to operate?

I believe the Metro car layout is similar to DLR units, with two cars sharing a central bogie. If these were separated, a spare bogie could be slipped under the remaining car since there is space provided, of course. The coming Picc trains appear to have conventional two bogie cars at the odd-numbered positions, albeit with end single door area removed. They can stand alone if uncoupled. The shorter even-numbered cars hang from the cars either side, and have no bogies. Given the restricted under-floor space for equipment, there is probably no space to insert a temporary bogie. I can only imagine that temporary accommodation bogies could be used to take the place of an adjoining car, and the wheel-less car attached beside this. Bakerloo and Waterloo & City cars will need to move by road to Acton for heavy overhaul, so some solution for splitting trains will have to be developed. Picc trains can remain complete to work there by rail for overhauls, as can Central line trains and current S stock.

Was the intention to have a train of four of these pairs, or was it just a demo for the articulation concept, and the train would have two halves of four cars with only conventional bogies at the outer ends of each half?