A visit to Hawthorn colliery in 1988 with photographs of hopper wagons, flats, locally constructed van and tank wagon; Other photographs are in "General railway photographs" https://paulbartlett.zenfolio.com/hawthorncolliery Hawthorn closed in 1992. The 3 link coupling symbol on many wagons indicates they were passed to travel over BR rails to the staithes. They have examination dates within them.