Gravity Fed Train Yard

Hello again,

For many years I have been working on a board for a Hump Yard(gravity fed sorting yard). It is labor intense with loads of controls to be made and lots of side track controllers. I will finish it someday!

In the meantime can you guess how I get this to work?

Watch the little video and give me your answer.

This picture is of the whole layout so far. It is big

Neil