European "buffer stops" won't work well with American couplers. Any stop has to be able to transfer the impact to an immovable object, usually the ground. Buffer stops do that by having the post and brace line up (more or less) with the buffers. Wheel stops transfer the impact to the rail. An American coupler is in the center of the car, so the bracing has to be in the center as well. Both of the European styles pictured would probably break the first time a coupler hit the middle of the boards.
I've never seen one, but a wooden bumper could be built, with a post in the center of the track, a heavy diagonal brace behind that, and a large block of wood for the coupler to butt against. More likely the railroad would use a steel bumper, made of rail and I-beams, and bolted to the track.. Most wooden end-of-track devices I've seen a simply a pile of ties nailed or bolted together.
