One of the best-selling EMD locos ever built, over 3,000 SD40-2s were sold in the US and Canada. During production, some prototype features were changed. These ready-to-run models are based on mid-production units. Like the prototype, these locos incorporate functioning ditch lights which can be switched between alternating (flashing) and steady lighting modes in DC (for DCC operation, ditch lights can be synchronized with horn or bell functions by installing an 8-pin sound decoder, sold separately). The models also come with all details and handrails installed, golden white LED headlights and illuminated, printed numberboards. They feature DCC-friendly construction with a 1.1" 28mm speaker housing in the fuel tank.