I'm getting the "Image Not Found" in your last posting.
You should be able to click on above image to enlarge. There may be some confusion on using the terms common, ground, etc.. Perhaps this diagram based on your original photo will help. I believe you've identified and made the connections shown as (1) and (2). What the guys are now talking about is connection (3). The (-) of your Accessory terminal block must be connected to the common or outer-rail of the track. This connection is typically made by running a wire between the Accessory transformer and the Train track transformer (common to common, ground to ground, or whatever you choose to call what is connected to the outer rail).
