This is similar to the M10000 transition car I made not to long ago. Once I had made that I knew this one was soon to follow. This one needed a few more tweaks to work for some unknown reason.
You would only need the coupler modification for that but I wanted the engine normal tender look with a passenger set behind. The tender that goes with the M10005 would/may not have the right look right behind the engine....but it's a thought.