It had four undergirder turntables, under six-spans of east-west aligned northern-light pitched roofs. The shed covered a total area of (six bays of } (six bays of ). The roofs were made of wood and steel rafters covered in Welsh slate tiles, supported on steel or cast iron columns, with solid London Brick Company walls. Laid out in an interconnecting 4-square pattern under the roof, each electrically operated turntable was fully boarded, and had 28 tracks spanning from it, able to accommodate locomotives up to in length.