Opened :1882

Closed : 1964

Engineering code : RSB

Length: 160m

The R&SBR runs parallel to the GWR Abergwynfi branch in the narrow Afan valley. The GWR branch arrived first and took the easier route, leaving the R&SBR having to negotiate less level ground. The R&SBR is most famous for its 3443 yard long Rhondda tunnel which has been partly backfilled. The Gelli Tunnel though is easily accessible. The tunnel is slightly curved, and lined in stone and brick