Here's my new town layout, with train too :-)
Its size is 4 x 8 baseplates, and there is still some space to add some buildings too.
Here's some "work in progress" photos: as you can see, the layout isn't 100% definitive.
http://www.brickshelf.com/gallery/legomane...ity_e200601.jpg
http://www.brickshelf.com/gallery/legomane...ity_e200602.jpg
http://www.brickshelf.com/gallery/legomane...ity_e200603.jpg
http://www.brickshelf.com/gallery/legomane...ity_e200604.jpg
Some of the buildings are the same of the old city, maybe I will replace or update some of them.
Seeya! :-D