19th century British flatcar technical equipped with a naval gun.
https://s3-us-west-1.amazonaws.com/h...val_cannon.jpg
Previously:
https://www.homemadetools.net/forum/...039#post153300
https://www.homemadetools.net/forum/...2448#post96338
https://www.homemadetools.net/forum/...2756#post97065
