3. The steamship in international trade.
4. Transportation before the days of the railroad.
5. The influence of the railroad in the advance of civilization.
6. Electrifying the railroads.
7. Speed, the cause of railroad accidents.
8. The observation car.
9. The care of food in the refrigerator car.
10. The work of the railroad repair-shop.
11. The advantage of railroad transportation over water transportation.
12. The advantage of water transportation over railroad transportation.