Yes mine are the same, there are metal on the inside of the brick once you pry it apart. There are little clips that hold the bottom plate in place, once you expose that the wire goes inside the brick and over some prongs that punch through the wire and make contact.
My wires have a 2X4 Black brick on both side that you can separate and there are prongs on the inside of the brick and metal sides that connect with at 9V transformer.
I can get the train to work with other wires, so it must be something I am doing wrong, but I put the meter up there and it seems to work, that is why I am hoping to find someone that has experience doing this and can help, it has me confused.