S2 E16 Bexhill West Model Railway | Lever Frame Part 2 | Mechanical Interlocking

This video (part 2) should have been a quick and easy one to make. All I'd planned to do was paint the outcome of part 1 and show it operating some stuff.
However, I've been happily steered off-task, by the loan of a wonderful Lever Frame complete with interlocking, and so I determined to fathom it out before working on my own any further.
I am very grateful to Luke Arnold, who upon hearing me mention mechanical interlocking kindly loaned me the frame and several useful books - all of which have delayed the video production schedule in a most fascinating way.
In this video, I explore mechanical interlocking with use of the frame and attempt to describe it the best I can.
I must stress that all of this is completely new to me, so please take all I say with some scepticism.
I hope you enjoy the video and thanks for watchinng,
James