Booklet titled "Instructions to Docks Traffic Staff for the working of the new Hump Yard - for Gravitation Shunting at the East End of Burrows Sidings, Swansea" dated 8 February 1927. Instructions to Docks Traffic Staff for the working of the new Hump Yard - for Gravitation Shunting at the East End of Burrows Sidings, Swansea