400 tons tunnel boring machine "Mom Chung" being put to work just days after its arrival from China where it was built. With its two sisters it will make its way from Caltrain in Soma to Chinatown at a ticket price if 1.6 billion usd. Humans will travel f · Flickr Backup

400 tons tunnel boring machine "Mom Chung" being put to work just days after its arrival from China where it was built. With its two sisters it will make its way from Caltrain in Soma to Chinatown at a ticket price if 1.6 billion usd. Humans will travel f