The HO EMD GP30 Seaboard Air Line SAL #506 Diesel Locomotive Shell is a 1:87 scale model replica of the Electro-Motive Diesel (EMD) locomotive. This pre-built, ready-to-go locomotive features a green color scheme and is made of plastic. It is a part of the SAL – Seaboard Air Line Railroad franchise and runs on the Two-Rail System. With a Bo-Bo wheel configuration and measuring 2 inches in height, this model is great for transportation-themed model railroads and train enthusiasts.