When it comes to couplers for engines and rail cars I used to look for my stock of kadee couplers. To be honest, kadee couplings look a bit awkward on a Dutch locomotive. It’s to big and looks like a street car in stead of a train. So I tried to apply a model chain/screw coupling and equipped the rail cars with proper sprung buffers. The only challenge is that they stay connected and do not get buffer-locked.