The new Drop-In decoders are carefully designed to make AirWire installation as easy as possible. The Drop-Ins take advantage of the locomotive’s existing wiring, connectors and lighting. Not only does the Drop-In exactly fit the inside dimensions of specific locomotives, it uses the exact same number and type of connectors, plugs and sockets to match the locomotive’s internal motor, lights and smoke generator wiring. Installation has never been easier. This decoder is designed to fit the current production model of the GP38 USA Trains locomotive. Its features include: