Our sons – our oldest boys – used to hop on the train and ride.  The train would go like this up the tracks, you know, sort of — they couldn’t go very fast – the tracks weren’t good enough.  So the boys would jump on the train and ride it up for a quarter of a mile and then they’d walk back down.  And you can almost walk with it, because it didn’t go much faster.  Probably not quite ten miles an hour, even.