 The train expanded from two trains to nine trains and three trolley lines (running in more than of track) in 2008.National Capital Trackers as well as other model railroading groups continued to set up, run, and maintain the model train.As of 2010, 56 smaller cut evergreen trees representing the states, District of Columbia, and unincorporated territories of the United States are arranged in a large oval around the National Christmas Tree each December.