On Bali, an island thick with beach tourists, surfing instructor Amri Anjulius is holding out for a 60km (37.3-mile) urban subway to relieve pressure on a maze of two-lane streets, where cars crawl and motor scooters weave between them.Like many Indonesians, he believes China will be at the forefront of efforts to expand the travel network across the archipelago nation’s 6,000 inhabited islands, home to 285 million people. That confidence stems from China’s role in building Southeast Asia’s...