you move everything from one layer to another one, then you try to move the empty layer to another scene?
i think this is the problem you have
so you only vew the first layer, move the complete layer into layer 6 or what ever and then you press CTRL+L and link the first layer to the other scene. but because the first layer is empty, nothing apears in the other scene.
just mark the layer you moved the stuff in and then press ctrl + l
edit, attatchment makes it a bit clearer (i hope)
edit2: the one time you linked the tires into the other scene, you didnt moove it onto another layer first