What were the materials to construct the transcontinental railroad?

I already knew the railroad was mostly constructed by hand by thousands of workers, but i need help to find out what kind of materials they used to build and construct the railroad. Also, what are the materials are in/on the railroad.

5 answers

http://www.generalcontractor.com/resources/articles/transcontinental-railroad.asp
Were the materials spikes and wood for both Union and Central Pacific railroads to construct the transcontinental railroad?
The website you provided me was not very informational on the materials.
http://www.generalcontractor.com/resources/articles/transcontinental-railroad.asp

I think that this site might answer your question of materials that were used.
The answer is Chinese immigrants.