I like this tutorial because it uses common materials and works for almost any kind of train: Making detailed oaks and maples.
It doesn’t hurt that the results look good too.
All posts for the day February 3rd, 2008
Making trees from wire, plaster and lichen
Posted by Dave Farquhar on February 3, 2008
http://dfarq.homeip.net/2008/02/making-trees-from-wire-plaster-and-lichen/