Template:Character Rail is a homunculus created by Huey Laforet as a test subject for his group "Rhythm". As a result of the experiments they have large stitch-marks running across their body and they lost their ability to feel the sensation of pain. Rail gets along with Nice because both of them have a love for bombs and they are presently traveling with Jacuzzi. Rail harbors a deep hatred for Huey.
Much like Ricardo, Rail is biologically female and refers to themself using the more masculine version of "I". Rail has told Czeslaw Meyer that they are indifferent to whatever gender they are perceived as, and thus are referred to in the article by singular "they" pronouns.