The Vogel Era describes the history of New Zealand between 1873 and 1876, when the country adopted an immigration and public works scheme inaugurated by the colonial treasurer, then premier, Julius Vogel to develop the country and to relieve the slump of the late 1860s; to be financed by borrowing overseas. His "Great Public Works Policy" resulted in a large increase in migrants and provision of many new railways, roads and telegraph lines. The railway system developed from a few lines in three gauges to the start of a national network including the main line from Christchurch to Dunedin, though the narrow "Cape gauge" required later upgrading to increase the restricted height and weight limits.