Klappentext

Some of the greatest developments in the history of transportation have happened under the ground! Subway systems and other underground transit methods changed the way people get from place to place, especially in big, crowded cities. Readers explore the fascinating history of underground transportation in this cool and colorful volume that supports STEM and social studies curriculum topics. The simple, clear text is approachable for young readers, and the pages are filled with colorful photographs that depict the past, present, and future of underground transportation systems.