Prototype Couplers

Prototype Couplers is a family business based in Vermont, USA, making scale model railroad couplers, tools, and accessories. Carrying forward the Sergent tradition, the company uses original tooling and in-house investment casting to create products for model railroaders seeking realistic appearance and operation.

Its range serves several scales, including HO, HOn3, S, O, and G. HO and HOn3 options include compatible-shank and narrow-shank couplers, while O scale products are offered with Kadee-compatible or Protocraft-compatible shanks. The company also provides accessories and tools to support workbench projects and layout building.

Prototype Couplers offers practical resources alongside its products, including guidance on coupler operation, scale and shank compatibility, assembly, installation, and finishing. Customers can also explore reference information, safety guidance, and images shared by other modelers. The website features product search by code, scale, or topic, as well as news and production updates through the company’s Facebook page. With its focus on prototypical detail and hands-on support, Prototype Couplers helps hobbyists select, assemble, and use couplers suited to their model railroad equipment.