"Granddaddy, how did people get around before there were buses?"
"Well, we had sort of trains called trolleys that ran on tracks in the middle of the street . . ."
"Granddaddy, why did they call them trolleys?"
"Well, they had these long things at the back, and when the motorman . . ."
"Granddaddy, what's a motorman?"
Don't despair, Granddad. As of right now, from Maine to California, the lit tle blister can be scooped up and taken out to any one of more than a dozen trolley museums. He can see the long,...