The MTH 40-1044 Realtrax Left Hand O-42 Switch is a high-quality model train accessory designed by MTH for use with O gauge model trains. This switch features a left-hand design and operates on the Realtrax type three-rail system. The switch is made of brass and plastic materials in a gray color, making it an attractive addition to any model railroad setup. With a scale of 1:48 and a vintage design, this switch is perfect for enhancing the realism and functionality of your model railroad layout.