(New Wortley) City  Island Flats in the background.

The red brick roundhouse,was built by Scottish railway engineer Thomas Grainger, assisted by engineer John Bourne, and was in use by 1847. It was built for the Leeds and Thirsk Railway Company which later amalgamated with the Leeds and Selby and the York and North Midland to become the North Eastern Railway. The roundhouse was designed with a single entrance track with 20 stabling bays radiating around a central turntable measuring approximately 12.75 metres (42'6") in diameter. Of the locomotives built at the roundhouse only one survives, the Areolite which was built and stabled here in 1851 by Kitson's of Leeds.The Areolite can be seen at the National Railway museum in York.

http://www.nrm.org.uk/