 All grapes destined for DOC wine production are limited to a maximum harvest yield of 10 tonnes/hectare with the finished wines required to have a minimum alcohol level of at least 12 percent.Val d'Orcia is crossed by a nineteenth-century railway, whose tracks, stations and tunnels have been restored to working order.The scenic line connects the small town of Asciano with Monte Antico for tourism purposes, using historic steam engines and carriages.