Couplers: II/I, III/I, IV/I, III/II, IV/II, I/P, II/P, III/P, IV/P, I–IV/P, P/I („noli me tangere“).
An unusual feature of Hope-Jones' planned organ design was a Great to Swell 2nd Touch coupler, and a knob for this exists on the console, though it appears to have never been connected.
At this time, the German railways, Faiveley and the Technical University of Berlin are developing possible transition scenarios for a general introduction of the C-AKv coupler.
Eli H. Janney (1831–1912), American inventor of the Janney coupler used in rail transport