You see something happen each time you end up on Lamour Rogers' Washington, D.C., Metrorail train.
As Rogers' voice booms over the public address system, people look up from their phones and newspapers left behind by someone else. They make eye contact. They smile at each other.
NPR's Renita Jablonski met with Rogers to find out what is so special about his voice and where his enthusiasm comes from day in and day out.