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, in the dried powder form, can be reconstituted, and is still used as a gelatin food product. It is an edible food product and can be consumed in amounts recommended for daily protein intake. It is also often used in the capsule coating of many medications for easier consumption.