![1. Walking, Running, Riding](/sites/engines/files/images/page/camelicon.jpg)
1. Walking, Running, Riding
![2. Animal-drawn Vehicles](/sites/engines/files/images/page/omnibusicon.jpg)
2. Animal-drawn Vehicles
![3. Bicycles and Motorcycles](/sites/engines/files/images/page/bicycleicon.jpg)
3. Bicycles and Motorcycles
![4. The Railway Locomotive](/sites/engines/files/images/page/locomotiveicon.jpg)
4. The Railway Locomotive
![5. Cables and Trolleys](/sites/engines/files/images/page/trolleyicon.jpg)
5. Cables and Trolleys
![6. The Automobile](/sites/engines/files/images/page/autoicon.jpg)
6. The Automobile
![7. Speed and Racing](/sites/engines/files/images/page/racericon.jpg)
7. Speed and Racing
![8. Underground: Tunnels, Subways](/sites/engines/files/images/page/tunnelicon.jpg)
8. Underground: Tunnels, Subways
![9. Other Vehicles & Issues](/sites/engines/files/images/page/oddvehicleicon.jpg)
9. Other Vehicles & Issues
![10. Power Sources](/sites/engines/files/images/page/engineicon.jpg)
10. Power Sources