The God of Destruction Under the Tracks is the eight OVA episode of History's Strongest Disciple Kenichi and it was bundled with volume 55 of the manga.
Ikki Takeda searches for a master to teach him boxing and runs into James Shiba who he starts pursuing and pressuring into becoming his master after accomplishing two unaccomplishable tasks for him, he relents and lets him become his disciple and starts training him. Kenichi gets a new uniform from his masters with pieces from each fighting style.
