Based off of the drawings provided for Martain Evan's 3/4" scale knuckle coupler, this coupler is designed to be fully functional and usable in the live steam hobby and community. Cosmetic modifications have been made beyond the functional capacities with some rounded corners and some material added to represent a more prototypical coupler. This particular version has a short shank to serve as a coupler on the front or "pilot" of the locomotive.