13. Why the larger railroads in our country run east and west.

14. The advantages of the pay-as-you-enter car.

15. The importance of the interurban electric railroads in country trade.

16. The disadvantages of the elevated system in large cities.

17. Congestion in the business district of a large city.

18. The underground system as a solution for congested traffic.

19. The work of a transfer company.

20. The motor truck decreases the business of the express companies.

21. The automobile decreases railroad suburban business.

Exercise 276