GWR Buffer stop
Here are some STLs representing a GWR style buffer stop. Currently two have been uploaded, they are identical other than the one having wooden type buffer beam and the other representing an rail beam.
I have printed these upright in one piece in PETG and other than the support being a bit tricky to remove from between the guard rails they printed fine.
Like many buffer stops there seem to have been many variations on a theme.

