943020 GWR Dia. O15 No. 99382, GWR grey post-1936 liveryRapido Trains UK unveils new GWR open wagons. A step change in GWR open wagon design occurred in 1902 when a fifth plank was added to its four plank design. The five plank became the GWRs standard wagon design and, essentially, variations on the post 1904 version with a 3ft 3in deep and 8ft body continued to be built well into the 1940s. We thought we ought to offer some of its five plank cousins too the Diagram O11 and the Dia. 015. Both were