World's longest cycling tunnel could be coming to Wales soon
"The Rhondda tunnel, which connects the Rhondda and Afan valleys, fell out of use in 1970 after 80 years of service on the Rhondda and Swansea Bay railway line, and the cuttings at each end were filled in. But a project, which has been more than 10 years in the making, aims to reopen it for cyclists and walkers."