Rail Barons of the World contains a new universal Rail Baron deck that can be used with any Railways of the World Series map as well as a solo mode for 7 Railways of the World Series maps - Eastern US, Mexico, Portugal, Nippon, Great Britain, Sweden, and Australia.

Each universal Rail Baron has a goal for the player to achieve to earn points while playing a Railways of the World Series map.

The new solo mode introduced into the Railways of the World Series adds new twists and challenges to 7 of the Railways of the World Series maps. The solo system was designed by Dávid Turczi & John Albertson.