Wooden beams wouldn't go into the concrete as that would be problematic. Some do have metal brackets attached to the wood but not all of them. With the lattice structure of wooden coasters the sheer number of points it contacts the ground (and more importantly the frequency) make it unneeded that they all attach. This is especially true with the older coasters that don't have the forces that some newer wooden coasters might have.
Wooden beams wouldn't go into the concrete as that would be problematic. Some do have metal brackets attached to the wood but not all of them. With the lattice structure of wooden coasters the sheer number of points it contacts the ground (and more importantly the frequency) make it unneeded that they all attach. This is especially true with the older coasters that don't have the forces that some newer wooden coasters might have.