They could be built almost anywhere.
Before the time that railroads were constructed, there was no way to travel across the country except to walk. That was probably very hard on families. Especially families with children. When railroads were constructed, that became an easy alternative for walking.
The railroad brought several advantages to the North. It helped get supplies to those who needed them. This included food. It was also a way to transport soldiers.
they both had a advantage agianst each other
In the North - a big tactical advantage for the Union.
North had more railroads which was an advantage to move people and supplies.
The north had more railroad systems, had a huge population advantage so the south was out-numbered, and they had more resources. Theres more than one to choose from for you.
It meant that whole armies could be moved by train, as well as all kinds of war supplies.
Railroads helped in the movement of supplies and troops, so if your line was cut off then it was harder to fight the war.
Railroads know that farmers need to ship their crops across the country, and there was really only one railroad going through their town, so they had no choice on which railroad. The railroads took advantage of this and over charged them.
it was a railroad \
Central Pacific Railroad and Union Pacific Railroad Company.
The south had interior lines of communication and a railroad system to exploit this advantage by shifting troops where they were needed. The south was also on the Gulf of Mexico, which was a commonly used trading port.
the Western and Atlantic railroad.