Plans to use former chicken factory for South Wales Metro The former Mayhew Chicken Factory site in Trecynon, as well as land at Willowford Road in Gwaelod-y-Garth, could be used for the new metro Sign up to FREE email alerts from Wales Online - Subscribe When you subscribe we will use the information you provide to send you these newsletters. Your information will be used in accordance with ourPrivacy Notice. Thank you for subscribingWe have more newslettersShow meSee ourprivacy notice A former chicken factory is one of two sites that could be used for the the long-awaited South Wales Metro scheme.