The Dinorwic Quarries Railway or Padarn Railway was in the same ownership as the Quarry. It was laid to four-foot gauge but carried two-foot (nominal, centre-to centre) gauge slate wagons on transporter wagons from the quarry yard at Gilfach-ddu to Penscoins, at the top of the escarpment overlooking Port Dinorwic. Here they were unloaded from the transporters and lowered down a self-acting incline to the Port, where they were shunted by locomotives to the quays.