China has banned almost all foreigners from entering Tibet since the protests began but foreign investors have managed to keep their projects going..."We're pleased that we're moving forward," said Bill Edward, vice-president of marketing at Tangula Group Ltd., which is charging as much as $5,500 (U.S.) per ticket for the luxury train to Tibet...Continental Minerals...is pushing ahead with plans for a $500-million copper and gold mine in central Tibet..."From day one, we have worked very carefully to establish ourselves as good corporate citizens in the area,"...said...Dickson Hall, the company's vice-president of business development...Bombardier and another Canadian company, Nortel Networks, played key roles in supplying equipment for China's controversial railway to Tibet in 2006.