Build the Atlantic Ocean tunnel
Connect all the cities
Maximize all the characteristics of one line
Let 10 line accidents happen at the same time
Make your first billion
Create a line to connect the remotest cities
Connect the most closely located cities
Improve the passenger comfort
Increase the speed at the lines
Increase the capacity of a line
Maximize the passenger comfort at 20 lines
Maximize the speed at 20 lines
Maximize the capacity of 20 lines