This adapter board with dimensions 47.5mm x 14.0mm fits in such Kato (USA) N-gauge locomotives that have a wide body design such as F-units. It replaces the original circuit board and has connection pads for motor and track as well as the function outputs AUX1, AUX2, AUX3, AUX4, AUX5, AUX6, AUX7 and AUX8. Either a LokSound 5 Nano or a LokPilot 5 Nano can be plugged into the E24 interface. Connection pads for an ESU PowerPack are also available of course.