I have two types of decoupling tracks on my layout. I had bought the Atlas O version a long time back then recently bought the Gargraves version. I really like the Gargraves track because its magnet is a lot longer than the Atlas O making it much easier to spot a car on the track for decoupling.
Below is the Gargraves wiring diagram. Note track power does not flow through the track so you will need power drops on both sides. I plan on making little 'milepost' signs to aid in spotting cars on each track.
Below are photos of the two tracks