The Iowa Traction Railroad (former Mason City & Clear Lake Ry.) Operates a 10-mile trolley freight operation in northern Iowa--- the last common carrier to do so in the U.S. Here's one of several video clips I took while there 3 weeks ago. Notice at 1:15, where the motorman comes out of the cab to give a friendly wave!
http://www.youtube.com/watch?v=Dv9faFQW_Vw
Enjoy,
Lee