Of course people voted for Public Transit, since in the picture that was shown during the contest, you could clearly see a monorail. LEGO then came back later to say they would not re-introduce the monorail system, but the damage was done.
So, no, I'm not surprised that the train featured in the sets is on wheels instead of a rail.
And I totally agree with ThinkingImpaired: if you're going to put some sort of train in a set, just put it on rails. Rail fans don't get that much to chew on anyways, so why not give them this? One train set a year doesn't quite cut it IMHO.





