The sidings are located on the other end of the A5 Watling Street in Brownhills near the border of Lichfield.
The sidings were built to connect the South Staffordshire Line to the coal fields at Chasewater and Cannock Chase.
This branch ran down Wharf Lane and connected near the present-day Chasewater Railway.
They are named after the Welsh island of the same name, as the landowner Henry Paget, 1st Marquess of Anglesey who lived at Beaudesert Hall, gave permission for the site to be developed.
The section through Hammerwich continued to serve the sidings for an oil terminal until 2001/02 when the entire line was closed.