Couplings.

The 3D printed diesel loco did not come with couplers so that was something I had to address. I needed to emulate something like thee coupling on the black loco in the picture below so out came some scrap plastic card and following some slicing and dicing suitable shaped couplers were crafted. These would be mounted on some plastic rod.

To attach the rod and coupler to the loco I needed to put a mounting on the back of the buffer beam. Again some scrap plastic card came in useful!

With that in place the couplings were mounted.

Just need to paint them now!