Austraila.
made and monitored slopes in railroad tracks.
The invention of the standard gauge made a network of railroad lines possible.
The Pennsylvania Railroad was built by John Edgar Thomson.
they started in Omaha, Nebraska.
Railroad cross ties made out of wood would float. Concrete railroad ties would not float.
Iron
Railroad tracks are made from steel.
I've been working on the railroad is about how the railroad was made. It is also about the trains and how they work. It is mostly about work in the olden days.
Gadsden
Rosa parks made and took the under ground railroad
Congress, railroad barons, banks, and investors.
The people who made the Underground Railroad work were called "Conductors". An example of a Conductor is Harriet Tubman.