JP,
the line was started in 1877, made Hindon by 1889 and onto Middlemarch by 1891, eventually reaching Clyde by 1907, end of the line at Cromwell 1921.
The 646 ft long Wingatui Viaduct has been the largest wrought iron structure in New Zealand since it was built in 1887 and is the longest and tallest (154ft) bridge on the Central Otago line.
Wingatui Viaduct under construction, on the Otago Central Railway Line. Ref: APG-1189-1/2-F. Alexander Turnbull Library, Wellington, New Zealand. /records/23116157