I purchased some gears and chain from Technobots in the UK thanks to a suggestion by a member of The Guild. While not up to the standard of the originals, beggars can't be.... well you know!
Here is the result of my ideas in this test bogie. Some deliberate and not so deliberate horrors introduced for the purposes of seeing how imperfection effects operation (I'm good at imperfection) . :>)
Two types of pickup being used... my usual wire method and flat brass strip ala some commercial offerings.
I have yet to add a tensioner for the chain.
Testing will commence when we have a layout to run it on.