Originally built to deal with timber loads, the Open C design started life in 1907 as Diagram.O8, the Great Western Railway continued making tweaks to the 15ft wheelbase design and subsequently produced the Dia. 016 in 1913/ 14, and the O19 in 1914. The Open C were also one of the first wagons to be designed to use the DC III brakes.
The O19 was produced right through to 1927, making it the longest-produced diagram of the Open C class of wagon. Further similar diagrams of the Open C were produced into the late 1940s. 
Despite its original designation as a timber wagon, it wasn’t long before the class was recorded. By World War Two they were considered tube vehicles, as steel tubing had since become their most common load. During this time period, they were also uprated to a 15-ton load capacity. New OO Gauge GWR Dia. O19 Open C ‘Tube’ wagon - 13 different versions are available. 
Tooling variants covering both flat-sided and sack truck door versions. 
Two different wheel designs. 
Separately fitted lashing rings. 
Fitted with metal bearings for free running.