There are several ways to power your layout. Most starter sets now come with a hand held remote and a power pack to power the track. All movements (forward, reverse) and sounds are made possible with the remote. You could also run you train with a smart device if the train is equipped with bluetooth.
Command Controlled means each locomotive is equipped with a "digital number" that only responds to signals meant specifically for it.The track is electrified at a constant voltage.The individual command-equipped locomotives can operated at low or fast speeds depending on what you tell it by way of a remote control wirelessly linked to a control box connected to the track. WIth this system, you can run multiple locomotives independently of each other.
The two digital command-control systems for O scale (O Gauge):
Both systems can be operated on the same track at the same time, and those desiring the most flexibility have equipped their layouts with both systems. For engines not equipped with command control electronics, both systems can operate conventional locomotives on seperate tracks, although with Lionel's Legacy systems you must purchase an additional box called the Power Master.