The Vintage Lionel Type 4851 Trainmaster Train Toy Transformer is a pre-built plastic transformer in red color, designed for model railroads and trains. With a voltage of 120 V and a compact size of 4.25" length, 3.5" width, and 3.0" height, this transformer is compatible with any control system and suitable for O gauge trains. This authentic Lionel model from the United States is perfect for collectors aged 17 years and up, adding a nostalgic touch to any train layout.