Learning Curve's Chuggington Interactive Railway brings the engines from the animated series to life via SmartTalk technology. This means that the engines recognize and interact with each other. The engines also interact with various railway pieces, activating sounds, lights, and phrases from the TV show. http://www.timetoplaymag.com/toys/2503/learning-curve/chuggington-interactive-railway-all-around-chuggington-set/