The Williams O Scale Pennsylvania Railroad (Green) Alco PA ABA Diesel Set is a pre-built model train set featuring a detailed replica of the Pennsylvania Railroad’s ABA diesel locomotives in a vibrant green color. The set is designed for collectors and enthusiasts aged 17 years and up, using an analog control system for easy operation on a three-rail system. With features like a horn and light function, this model accurately captures the essence of the classic Pennsylvania Railroad while providing hours of enjoyment for train lovers of all ages.