The Otago Central Railway or Otago Central Branch Railway (OCB), now often referred to as the Taieri Gorge Railway, was a secondary railway line in Central Otago, in the South Island of New Zealand. Construction of the OCB began in 1877 and the 27-km section to Hindon was opened in 1889. The line was completed to Middlemarch two years later. The line reached Cromwell, 236 km, in 1921. The Clyde - Cromwell section (20 km) was closed in 1980 due to construction of the Clyde Dam, a hydro-electric power station in the Cromwell Gorge on the Clutha River.