The answer is yes.
Using the 13v~ (alternate) output of the grey line transformer you can command the blue line switches.
This is not in the manual of the new transformer (it is a kind of hidden door to the past) and the blue line transformer switches output was 16v~, but I've tried it and it works.
They are protective locks. If something (let’s say kids hair, or part of their clothes) gets stuck and dragged inside the wheel, these tiny blocks will lock the wheels and make sure it doesn’t keep dragging whatever is stuck. As soon as you pull the stuck part back, the springs unlock.