As the Metro Gold Line’s sleek train approaches Union Station, the east-bound passengers waiting on the platform come to attention. Giggling teenage girls with studded lips and bright fuscia hair stop smacking their chewing gum. A young guy, shaking his head to the sound of his earphones, grips his skateboard more tightly to his chest. Another man, jeans splattered with white paint, firmly guides his bicycle. A woman in an electric wheelchair moves forward down the platform. They are all headed East….