NCE plug and play 5 function decoder. It will fit the following locomotives: Atlas GP38, GP40, RS1, RS2, RS3, C424, C425, GP7, RSD4, RSD5, RSD12, C30-7, U23B, U33C, U36C, F3A/B, F7A/B; Athearn SD70, SD75, Kato GP35, SD40; Stewart AS16, F9A/B, U25B; Plus others. For specs visit the product's webpage by clicking on the link below. As always call to see if you qualify for any additional discounts, and to check the accuracy of your order's weight. This unit lists for $24.95