Fascinating Facts • In the 1820s many of the nation’s railcars were pulled along their tracks by teams of horses • The city of Cheyenne, Wyoming, was built by Union Pacific workers as a place to live while working in the area • When trains first became popular, some doctors warned that riding them at such fast speeds was not healthy Genre Nonfiction Comprehension Skill Sequence Text Features • Map • Sidebar • Captions Scott Foresman Social Studies ISBN 0-328-14865-2 ì