When Palmer, Kelly's commanding officer during the Civil War, asks for help, the old Irishman is happy to oblige - especially since one of his employees is killed by a shotgun blast meant for the former general. Palmer explains that a rival railroad is trying to prevent his company, the Denver and Rio Grande, from making a successful trip to Leadville and will stop at nothing - even killing their passenger, President Ulysses S. Grant, to put him out of business. (thetvdb.com)