Home»All Photographs»Britain's Railway Wagons & other rolling stock»GWR Rolling Stock»GWR 20t ballast opens - Tunny ZCO ZXO

The final common design of steel open ballast wagon was introduced in 1907 and rated at 20tons. Later designs were 21 ft. 6in. over headstocks with 12ft wheelbase. Built up to nationalisation their code name TUNNY was sometimes carried, including being mis-spelt as TUNNEY, even on official BR documents. The CO mark dates back to at least 1929 on the GWR and means vehicles under the control of the Chief Office.