The Underground Railroad was neither underground nor a railroad. It got its name because its activities had to be carried out in secret, using darkness or disguise, and because railway terms were used by those involved with system to describe how it worked.
Hydrolyzed collagen is collagen that is derived from bovine bone and cartilage. Usually, the bone is crushed, ground, defatted, soaked in acid to remove the calcium, soaked again to break the collagen bonds and then dehydrated.
Hydrolyzed collagen is taken in doses of around 10g a day for skin health and some benefits to joints, and can be taken with meals. It should not be taken in higher doses as a Protein Supplement (for muscle gain and fat loss) due to having less efficacy than other protein sources and a lacklustre amino acid profile.