Atlas Switches. Using a regular atlas switch motor you can put insulated piece of track 1 or 2 inches long to the switch motor. When the train hits the insulated section of track it will throw the switch. If you go over 2 inches you can not leave a car or engine on the insulated piece of track because it will keep power to the motor and burn up the switch motor. That is why you only use 1 or 2 inches of insulated track.
If you need atlas track or switches I have some for sale on the For Sale Section of the Forum. If you have any questions you can email at email@example.com