4F-080-135 OO Gauge 8 Plank SR 37786 WeatheredPristine Version shown The 8 plank wagon was a development of the earlier 7 plank version and was primarily a coal wagon for the less dense forms such as coke,. The extra height given by the additional plank allowed the wagon to carry its full 12 ton capacity. The wagons were built from the late 1920s to the end of the 1930s and were used right up to the 1960s. Their designs incorporated a side door on each side of the wagon and one end door to aid