Return to RAM – As the affordable care marketplace has seen premiums rise and Medicaid faces its biggest cuts ever, correspondent Scott Pelley revisits one charity, Remote Area Medical, that delivers aid to Americans cut off from healthcare by location and cost. At one of RAM's free pop-up clinics, Pelley meets patients sleeping in their cars and standing in line, many hundreds of miles from their homes, in desperate need of care. Henry Schuster and Sarah Turcotte are the producers.Ghost Train – Countries around the world have built high-speed rail – why has it failed to catch on in the U.S.? An ambitious state-run project connecting L.A. and San Francisco is vastly behind schedule and has seen costs balloon. One private company is hoping to succeed where the public sector hasn't – but that too faces challenges. Correspondent Jon Wertheim reports on the state of high-speed rail in the U.S., which has become a stand-in for a broader question: can America still build big things? David M. Levine is the producer.The Mardi Gras Indians – Every year on Mardi Gras, Black revelers roam the backstreets of New Orleans in dazzling hand-sewn suits that take an entire year to create. Correspondent Bill Whitaker meets the Mardi Gras Indians, also known as Black Masking Indians, one of America's last secret societies, who are preserving a culture that dates to at least the 1800s. It's a tradition marked by resilience and resistance that honors their ancestors. Nichole Marks is the producer.