A lovely smooth running locomotive. It is one of the newest generation of "DCC ready" models with a socket for a 6 pin decoder.
A Digitrax DZ125IN decoder is a "plug in" fit into this chassis. It really is a 2 minute job start to finish.
The couplers have been replaced by Micro-Trains type. The standard coupler is mounted on the bogie, and has been replaced by a 1015-1 "body mount" coupler epoxied onto the bogie. The standard coupler removed by pulling out a pin; that leaves 4 sides of a rectangular box. Cut away the width of that box slightly, and the new coupler will fit. I had to mount it on top of the "shim" that's supplied with it to get it to the height use. I also had to file away the plastic under the buffers to prevent the new coupling fouling the body in tight corners.