The wheel Structure rotates off off the train, It could turn, but it would have to be a fairly large radius.  Any other way I designed it, It ljust looked to cluttered, and I did want to place well in the competition.  One of the Big sticking points for the Judges, is neatness, and clarity.  Next year I think I'll have to sacrifice some of that, so I can make it a lot more realistic, and score well because of that.