I bought one with simulation and braking control, it had 2 control arms, together with an uncased transformer that had 2 independent windings. I believe it must have been at the annual Manchester exhibition in the mid to late 70s. I expect Scalespeed's founder was there himself I remember buying at least one if not two of the spare control arms too. The controller performed very smoothly from my memory, due to various circumstances I don't currently have a layout but would wish to use something that had that degree of analogue control on any future project, at least one is already in the planning stage. I liked the fact that were ready to panel mount too.
GC&Mid